1988 AJHSME Problems/Problem 23
Problem
Maria buys computer disks at a price of 
for <dollar/>
and sells them at a price of 
for <dollar/>. How many computer disks must she sell in order to make a profit of <dollar/>
?
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 
