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Question

Michael’s savings decreased by 10% to $400. A week later, his savings decreased further by 20%.
a.) What was Michael’s savings at first?
b.) What was Michael’s savings in the end?

Answer

Let me try.

a) Let S be the original savings at first.
So ((100 – 10)/100) S = $400
=> (90/100) S = 400
=> S = 400 * 100/90 = $444.44 #

b) Let T be Michael’s savings in the end
So T = ((100 – 20)/100) x 400
=> T = (80/100) x 400 = $320 #

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