Answer: Approximately 37.037% increase
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Work Shown:
a = old value = 54
b = new value = 74
c = change in values
c = b-a
c = 74-54
c = 20
The positive c value tells us that we have a percent increase.
Then divide over the starting value a = 54
c/a = 20/54 = 0.37037
We have a percent increase of 37.037% which is approximate.
Move the decimal point two spots to the right to go from decimal form to percentage form.
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A slightly different approach:
a = old value = 54
b = new value = 74
b/a = ratio of the values
b/a = 74/54
b/a = 1.37037
This ratio is larger than 1 to indicate a percentage increase.
Subtract off 1 to get 0.37037 which then converts to 37.037%