2002 AMC 8 Problems/Problem 14

Revision as of 21:09, 29 July 2012 by Mrdavid445 (talk | contribs) (Solution #1)

Problem 14

A merchant offers a large group of items at $30\%$ off. Later, the merchant takes $20\%$ off these sale prices and claims that the final price of these items is $50\%$ off the original price. The total discount is


$\text{(A)}\ 35\%\qquad\text{(B)}\ 44\%\qquad\text{(C)}\ 50\%\qquad\text{(D)}\ 56\%\qquad\text{(E)}\ 60\%$

Solution #1

Let's assume that each item is $100. First we take off $30\%$ off of $100. $100\cdot0.70=$$70

Next, we take off the extra$ (Error compiling LaTeX. ! Missing $ inserted.)20\%$as asked by the problem. $70\cdot0.80=$56

So the final price of an item is $56. We have to do$ (Error compiling LaTeX. ! Missing $ inserted.)100-56$because$56$was the final price and we wanted the discount.$100-56=44$so the final discount was$44\%$$ (Error compiling LaTeX. ! Missing $ inserted.) \text{(A)}\ 35\%\qquad\boxed{\text{(B)}\ 44\%}\qquad\text{(C)}\ 50\%\qquad\text{(D)}\ 56\%\qquad\text{(E)}\ 60\% $

Solution #2

Assume the price was $100. We can just do $100\cdot0.7\cdot0.8=56$ and then do $100-56=44$ That is the discount percentage wise.

$\text{(A)}\ 35\%\qquad\boxed{\text{(B)}\ 44\%}\qquad\text{(C)}\ 50\%\qquad\text{(D)}\ 56\%\qquad\text{(E)}\ 60\%$

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