Percent differentials are used to give a means of comparing changes within quantities or amounts. A Percent differential express the relationship among some initial condition and another specified condition.
The technique of calculating percent differential involves the subsequent:
Step 1: Subtract the original value from the present value.
Step 2: Divide by the original value.
Step 3: Multiply by 100.
Step 4: Add the percent symbol (%).
A tank initially contains 50 gallons of water. Five gallons are drained out. Through what percent is the amount of water in the tank decreased?
Step 1: The difference among initial and final is given in the problem: 5 gallons.
Step 2: 5/50 = 0.1
Step 3: 0.1 x 100 = 10% Five gallons represents 10% of the original 50 gals that were in the tank.