Tom planned to make 20 spare parts but actually made 25 spare parts. what is the percentage of increase?

First: find the amount of increase:

25-20=5

Secondly, ask yourself: increase from “what”? the answer to “what” is “20” so 20 is the amount in 1

3 elements:

the amount in 1: 20

the fraction: percentage of increase?

the amount in the fraction: amount of increase, 5

The fraction= percentage of increase= the amount in a fraction ÷ the amount in 1= 5÷20=25%

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