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1988 AJHSME #23

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June 21, 2011
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Problem Statement

Maria buys computer disks at a price of 4 for 5 dollars and sells them at a price of 3 for 5 dollars. How many computer disks must she sell in order to make a profit of 100 dolars?
(A) 100(B) 120(C) 200(D) 240(E) 1200 \text{(A)}\ 100\qquad\text{(B)}\ 120\qquad\text{(C)}\ 200\qquad\text{(D)}\ 240\qquad\text{(E)}\ 1200
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