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There is a percentage decrease of 50% in the number of people from 72 people to 36 people
What is an equation?
An equation is an expression used to show the relationship between two or more numbers and variables.
There is a change of 72 people to 36 people, hence:
Percentage change = [(36 - 72) / 72] * 100% = -50%
There is a percentage decrease of 50% in the number of people from 72 people to 36 people
Find out more on equation at: https://brainly.com/question/2972832