Pappu purchases 2 gadgets for Rs. 1120. He sells one at 15% profit and the other at 10% loss. He neither gains nor loses. The difference in the cost prices of 2 gadgets is?
Let the price of the 2 gadgets be x and y.
Thus x+y=1120
Now let x be sold at 15% profit and y be sold at 10% loss.
Thus 115x+90y=112000
Or 115x - 90(1120-x) = 112000
Or 115x - 90x + 100800 = 112000
Or 25x = 11200
Or x = 448
Thus y = 672
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Aman Tiwari
Pure mathematics is the world's best game. It is more absorbing than chess, more of a gamble than poker, and lasts longer than Monopoly. It's free. It can be played anywhere - Archimedes did it in a bathtub.