Suppose I buy a laptop for ¥87 500 and keep it for 3 years

MATHEMATICS · Multi-part · AoPS · Mathematics · Exponents and Logarithms · Exponents and Logarithms

Problem

Suppose I buy a laptop for ¥87 500 and keep it for 3 years. During this time it depreciates at an annual rate of 30%. (a) Find its value after 3 years. (b) By how much has the laptop depreciated?

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