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Mathematics, 25.08.2021 01:20 xhdud

Can someone explain how this equation is solved? I have it already solved but I don't understand how the outcome is got but here is the problem. Selling price=(1+r)(original cost)
63=(1+r)(42)
1.5=1+r
r=0.5

How did we go from that first part of the problem to the second; what was done exactly?

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Can someone explain how this equation is solved? I have it already solved but I don't understand how...

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