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I dont know how to do this question

I dont know how to do this question-example-1

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Explanation:

x = original number of sales

income = x * p now increase the price to 1/3 more

income = x * 1 1/3 p now DECREASE the number of sales

income = 3/5 x * 1 1/3 p and simplify

3/5 * 4/3 * x * p

12/15 x * p

4/5 x * p

this 4/5 of the original x * p

a DECREASE of 1/5

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