Increasing by a constant percent rate

​Which situation describes a quantity that increases by a constant percent rate?
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A.) The size of one photo is 15% larger than the size of another photo
B.) The number of plants in a pond is 85% of the number from the previous year
C.) The population of one city is 85% greater than the population of another city
D.) The number of magazine subscribers each year is 15% greater than the previous year

A quantity that grows by a constant percentage rate will increase by the same percentage rate from year to year.

​D.) The number of magazine subscribers each year is 15% greater than the previous year

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