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Problem 9 (2008 AMC 8)

AMC 8Easy

From module Arithmetic and Number Theory Basics

Problem

In 20052005 Tycoon Tammy invested \100fortwoyears.Duringthefirstyearherinvestmentsufferedafor two years. During the first year her investment suffered a15%loss,butduringthesecondyeartheremaininginvestmentshowedaloss, but during the second year the remaining investment showed a20%$ gain. Over the two-year period, what was the change in Tammy's investment?

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