Question

The profit on a watch is 15% of the cost price. If the profit is $150. find
i) the cost price of the watch.
(ii) the selling price of the watch.

Answer 1

Answer:

Let the CP of the watch be Rs.x.  

Case I,

Therefore, SP = 120x100=Rs.6x5120x100=Rs.6x5

Case II,  

CP = Rs.(x - 100)  

SP = Rs. (6x5−100)(6x5−100)

Profit = (6x5−x)=Rs.x5(6x5−x)=Rs.x5

Therefore, x5x−100×100=25x5x−100×100=25

=> 25x - 2500 = 20x

=> 5x = 2500

=> x = 2500525005 = Rs.500

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