Is negative percentage valid as per mathematics?
969965
In a word: yes. Negative percentages do have a real meaning. Percentages are simply ratios; in mathematics there's nothing wrong with having a ratio such as -1/2, just like there is nothing wrong with having a percentage of -50%. \n\nA percentage just measures one variable with respect to another. Negative percentages typically occur when a certain variable changes with respect to another; in these cases, an increase will result in a positive percentage and a decrease will result in a negative percentage.\n\nFor instance, imagine that a business pulls in $100 in profit one month and $80 in profit the next month. That is, the business lost $20 in profits over the second month. The *change* in monthly profits for this period is -20%. Similarly, if the same business makes $120 instead of $80 for the second month, then the business made $20 in profits over the second month and the *change* in monthly profits is +20%.\n\nNote the asterisks around the word "change." If the second month only provided $80 profit, this is 80% of the first month, but the CHANGE in profit is -20%. The negative sign indicates that profits dropped 20%, from 100% to 80%. Note that all of these conventions signify the same thing mathematically.
905513
Although your question is a bit broad, I have the following general rules about percents/percentages for you:\n\n1.  Think of "percent" meaning literally "per 100".  If I ask "What percent of 300 is 15?" ... you can visualize 300 as "three 100's" and then realize that 15 is "three 5's" ... so the answer turns out to be "5 percent" or 5%.\n (Most people today don't think this way, I do.)\n\n2.  The % sign after a number means "percent", and has the same effect as moving the number's decimal TWO PLACES TO THE LEFT.  4% means 0.04\nAnother example:  15.2% means 0.152\n\n3.  Whenever a percent problem contains the word "of" you can often replace it with "times".  Likewise, the word "is" or "makes" often means "=".  The word "what" means 'x' or the unknown in the problem.\n\n Example:  "20 is what percent of 25?"\n\n  Mathematically, this suggests:\n\n                 20 = N * 25\n\nNow, you just divide by 25 to isolate the N:\n\n            20/25 = N\n              0.80 = N\n\nMove the decimal two places TO THE RIGHT to convert 0.80 into percentage:  N = 80%\n\n\nHope this helps!
302338
take away the percent sign, move decimal 2 to the left.ie: 25% = .25\noops... sorry, reverse that.
1171599
.(–2.5)(20) = -50\n\narithmetic, not algebra
423596
1/14 X 100% = 7%\n\nu r right
647207
50%.\nSorry, this answer may hurt you, but it is the thruth.
1147597
Is that the same principle as two negatives making a positive?\nThen the answer would be yes.
860023
So, to convert from decimal to percentage, just multiply the decimal by 100, but remember to put the "%" sign so people know it is per 100.\n\nThe easiest way to multiply by 100 is to move the decimal point 2 places to the right:
248139
If you mean percentages as in survey statistics, None.\nEverything is relative to the way a question is asked, who is asked, and then how an individual percieves the question, and then whether or not the question is answered\nhonestly.All those variables make for extreme gaps in accuracy.
143047
Because it is expressed as a percentage of the entire working population.  If we have 7% UNemployment we also have 93% employment.  A negative UNemployment number would not fit with the maxim of 100%.  \n\nSee how the math doesn't work with a negative?\n\n-7% + X% = 100%\nX = 107%
921859
No, because the opposite of -5 is 5 which is positive; the opposite of 0 is 0 which is neither positive nor negative.\n\nThis is why the expression "-x" should never be read as "negative x" but rather "the opposite of x" since if x itself were negative, -x would be positive.
140069
If all questions are worth equal value, each is worth 2%. 1 wrong is 98%, 2 wrong is 96%, and so on. 9 wrong would be 82%.\n\nYou can use the formula y=100-2x, where y is the percentage right, and x is the number you got wrong. Or for any test, y=100-(100/z)x, where y is the percentage right, x is the number you got wrong, and z is the number of questions on the test.
1102902
a 50/50 chance is a 99/100 not sure because the chances are much lower.\nany chances that is in a positive sure gives us a 75% up.\nour mind tells us that we knew for the fact the result may be given. but lower to that , if we are not quite sure about it, then, chances are lower. "come what may", if that's what you think.
857902
Is this what you want? \n \nBlood type and Rh            How many people have it? \n \nO +                                    40 % \n O -                                      7 % \n A +                                    34 % \n A -                                        6 % \n B +                                       8 % \n B -                                        1 % \n AB +                                     3 % \n AB -                                      1 %
772663
Here are your answers\na) 55% = 0.55\nb) 60% = 0.6\nc) 65.5% = 0.655\nd) 84.6% = 0.846\n\nHere is an easy rule to follow.  Put the decimal point in front of the percent and you will always be right..when less then 10% then include a zero before the number.\n\nexamples\n\n2% = .02\n4% = .04\n\n35.4 % = .354\n\nand one they might give you to try to confuse you\n\n24.06% = .2406\n\nuse this method and you should ace it, 100%  (which equals 1.0) correct!!!
700071
Yes. If you multiply it out it is the same. The square kills off that minus sign because any real number squared is positive.\n\n\nz
246108
62.5%\n\nJust move the decimal over 2 places to the right.\n\n-OR-\n\n.625 x 100 = 62.5%