Question

In 3 years, a gym membership went up from 6,400 to 8,400. Write an expression that shows how to find the percent of increase. Then find the percent of increase.

Answer 1

• change = (new/old -1)×100%
• 31.25%

Explanation:

Percent change is found using the formula ...

percent change = ((new value) - (old value))/(old value) × 100%

This can be divided out to be ...

percent change = ((new value)/(old value) -1) × 100%

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For your numbers, the change is ...

percent change = (8400 -6400)/6400 × 100% = 31.25%