Difference between revisions of "1988 AJHSME Problems/Problem 23"
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==Problem== | ==Problem== | ||
| − | Maria buys computer disks at a price of <math>4</math> for <dollar/ | + | Maria buys computer disks at a price of <math>4</math> for <math><dollar/>5</math> and sells them at a price of <math>3</math> for <math><dollar/>5</math>. How many computer disks must she sell in order to make a profit of <math><dollar/>100</math>? |
<math>\text{(A)}\ 100 \qquad \text{(B)}\ 120 \qquad \text{(C)}\ 200 \qquad \text{(D)}\ 240 \qquad \text{(E)}\ 1200</math> | <math>\text{(A)}\ 100 \qquad \text{(B)}\ 120 \qquad \text{(C)}\ 200 \qquad \text{(D)}\ 240 \qquad \text{(E)}\ 1200</math> | ||
Revision as of 22:29, 17 January 2016
Problem
Maria buys computer disks at a price of 
for 
and sells them at a price of 
for . How many computer disks must she sell in order to make a profit of 
?
Solution
This is the equivalent of saying she buys 
for <dollar/>
and sells for <dollar/>
, so for every dozen disks she sells, she profits <dollar/>
.
She needs to profit <dollar/>
, so she needs to sell 
dozen disks, which is 
See Also
| 1988 AJHSME (Problems • Answer Key • Resources) | ||
| Preceded by Problem 22 |
Followed by Problem 24 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
| All AJHSME/AMC 8 Problems and Solutions | ||
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. 
