AMC 10 Step by Step
2003 AMC 10BProblem 12P11-15~2 minPrint

Al, Betty, and Clare split $1000\$1000 among them to be invested in different ways. Each begins with a different amount. At the end of one year, they have a total of $1500\$1500 dollars. Betty and Clare have both doubled their money, whereas Al has managed to lose $100\$100 dollars. What was Al's original portion?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.