Successive percentage change

Rarely Tested

For two successive changes of of x% and y%, the total % change is (x + y + xy/100)%
Note: If there is a decrease, then take a negative sign before the percentage.

Question 1

The rice production in Thailand increased by 20% from 2011 to 2012 and increased by 10% from 2012 to 2013. Find the % increase in rice production from 2011 to 2013.

Question 2

Ram’s salary increased by 10%, 12%, and 15% in the first, second, and third years, respectively. Determine the average annual percentage increase in Ram’s salary (rounded to one decimal place)

Question 3

The perimeter of a triangle is increased by 10%, with all sides increasing proportionately. What is the % increase in the area of the triangle?

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Name	Date Taken	Score
Formula Test 1	NA	NA
Formula Test 2	NA	NA
Formula Test 3	NA	NA
Formula Test 4	NA	NA

Formula Test 1

Not attempted

Formula Test 2

Not attempted

Formula Test 3

Not attempted

Formula Test 4

Not attempted

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Other Averages, Ratio and Proportion Formulas

Averages

Percentage change

Operations on Ratios

Proportionality

Successive percentage change

Formula Test 1

Formula Test 2

Formula Test 3

Formula Test 4

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