SOLUTION: The Office Store sells a box of computer disks for $11.99 while using a markup of 35% on selling price. Find the cost.

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Question 1129825: The Office Store sells a box of computer disks for $11.99 while using a markup of 35% on selling price. Find the cost.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
c, the cost for the computer disks before markup

c%2B0.35c=11.99
1.35c=11.99
c=11.99%2F1.35