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Amount of Interest

Source: 1971 AHSME Problem 4

April 17, 2014
AMC

Problem Statement

After simple interest for two months at 5%5\% per annum was credited, a Boy Scout Troop had a total of \textdollar 255.31 in the Council Treasury. The interest credited was a number of dollars plus the following number of cents
<spanclass=latexbold>(A)</span>11<spanclass=latexbold>(B)</span>12<spanclass=latexbold>(C)</span>13<spanclass=latexbold>(D)</span>21<spanclass=latexbold>(E)</span>31<span class='latex-bold'>(A) </span>11\qquad<span class='latex-bold'>(B) </span>12\qquad<span class='latex-bold'>(C) </span>13\qquad<span class='latex-bold'>(D) </span>21\qquad <span class='latex-bold'>(E) </span>31