To calculate percentage increases and decreases, we use Percentage multipliers. Percentage multipliers allow us to calculate percentage increases and percentage decreases very quickly, with one single multiplication.
By the end of this section we'll know how to find percentage multipliers as well as calculate any percentage increase, or decrease, such as:
In the following tutorial we learn how to calculate percentage increases and decreases using percentage multipliers.
The method shown in the tutorial is summarized here in three steps.
To increase, or decrease a number \(N\), by a percentage \(X\% \) we multiply \(N\) by a percentage multiplier (often just called multiplier).
We can calculate any percentage increase, or decrease, in three steps:
Increase \(80\) kg by \(23\% \).
We follow our three-step method:
Decrease \(\$ \ 120\) by \(19\% \).
We follow our three-step method:
Find the percentage multipliers for each of the following increases and decreases:
Using a percentage multiplier, and stating its value, calculate each of the following:
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