Ethanol Has a Specific Gravity of 0

Ethanol has a specific gravity of 0.78 at a certain temperature. If the density of water at the same temperature is 62.4 pounds per cubic foot, what is the density of ethanol at this temperature? Hint: Remember that when converting derived units, you must convert each of the component fundamental units individually.

A) 4.15 lbs/ft³
B) 48.672 lbs/ft³
C) 0.0125 lbs/ft³
D) 80.0 lbs/ft³
E) 13.7 lbs/ft³