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Given that Rolex buys computer disks at a price of 4 for $5 .
That means cost price of 1 disk = 5/4
Given that Rolex sells them at a price of 3 for $5.
That means selling price of 1 disk = 5/3
Profit on 1 disk = selling price - cost price
Profit on 1 disk
Profit on 1 disk
Profit on 1 disk
Profit on 1 disk
Now we have to find how many disk to be sold to get the profit $100
so we just divide $100 by profit on 1 disk
Hence final answer is 240 disks.