function getKeroseneValue(
    uint id
  )
    public
    view
    returns (uint) {
      uint totalUsdValue;
      uint numberOfVaults = vaultsKerosene[id].length();
      for (uint i = 0; i < numberOfVaults; i++) {
        Vault vault = Vault(vaultsKerosene[id].at(i));
        uint usdValue;
        if (keroseneManager.isLicensed(address(vault))) {
          usdValue = vault.getUsdValue(id);
        }
        totalUsdValue += usdValue;
      }
      return totalUsdValue;
  }

function getTotalUsdValue(
    uint id
  )
    public
    view
    returns (uint) {
      return getNonKeroseneValue(id) + getKeroseneValue(id);
  }
