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Difference between revisions of "1988 AJHSME Problems/Problem 8"

(New page: ==Problem== Betty used a calculator to find the product <math>0.075 \times 2.56</math>. She forgot to enter the decimal points. The calculator showed <math>19200</math>. If Betty had e...)
(No difference)

Revision as of 07:07, 15 April 2009

Problem

Betty used a calculator to find the product $0.075 \times 2.56$. She forgot to enter the decimal points. The calculator showed $19200$. If Betty had entered the decimal points correctly, the answer would have been

$\text{(A)}\ .0192 \qquad \text{(B)}\ .192 \qquad \text{(C)}\ 1.92 \qquad \text{(D)}\ 19.2 \qquad \text{(E)}\ 192$

Solution

The decimal point of 0.075 is three away from what Betty punched in, and that of 2.56 is two away. The decimal point is therefore $3+2=5$. units to the left of where it should be, so we would want $.19200\Rightarrow \mathrm{(B)}$.

See Also

1988 AJHSME Problems

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