let before_fees = (Decimal256::one()
    .checked_sub(pool_fees.protocol_fee.to_decimal_256())?
    .checked_sub(pool_fees.swap_fee.to_decimal_256())?
    .checked_sub(pool_fees.burn_fee.to_decimal_256())?)
.inv()
.unwrap_or_else(Decimal256::one)
.checked_mul(Decimal256::decimal_with_precision(
    ask_asset.amount,
    ask_decimal,
)?)?;
let before_fees = (Decimal256::one()
    .checked_sub(pool_fees.protocol_fee.to_decimal_256())?
    .checked_sub(pool_fees.swap_fee.to_decimal_256())?
    .checked_sub(pool_fees.burn_fee.to_decimal_256())?
    .checked_sub(pool_fees.extra_fees.iter().fold(
        Decimal256::zero(),
        |acc, fee| {
            acc.checked_add(fee.to_decimal_256())
                .unwrap_or(Decimal256::zero())
        },
    ))?)
.inv()
.unwrap_or_else(Decimal256::one)
.checked_mul(Decimal256::decimal_with_precision(
    ask_asset.amount,
    ask_decimal,
)?)?;
