How To Calculate Change In Revenue. Multiply that by 100, and you'll have the revenue percentage change between the two periods. $15,000 divided by $85,000 equals 0.176.

Change in quantity is the total additional quantity. The marginal revenue is the rate of change of the total revenue. First, calculate the difference between the initial value and the final value, but in reverse from the previous steps.

How To Calculate Decrease In Revenue. To determine which outweighs the other we can look at elasticity: The 25 percent reduction in revenue is calculated one of two ways:

25/75 =.33, or a 33% decrease. First, we divide the most current revenue number by the beginning revenue number, $10 million divided by $15 million. Multiply that by 100, and you'll have the revenue percentage change between the two periods.