Mark brought 20 dozen note books for Rs. 156 per dozen. He sold 8 dozen of them at 10% gain and the remaining 12 dozen at 20% gain. What is his % in whole transaction?
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CP of 12 notebooks = Rs 48
CP of 1 notebook = Rs 48/12
CP of 240 notebooks = Rs 4 x 240 = Rs 960
CP of 96 notebooks = Rs 4 x 96 = Rs 384
CP of 144 notebooks = Rs 4 x 144 = Rs 576
Gain on 96 notebooks = 10% of Rs 384 = Rs 38.4
Gain on 144 notebooks = 20% of Rs 576 = Rs 115.2
Total gain = Rs 38.4 + Rs 115.2 = Rs 153.6
Therefore gain percent= 153.6/960 x 100% = 16%(Ans)
CP of 1 notebook = Rs 48/12
CP of 240 notebooks = Rs 4 x 240 = Rs 960
CP of 96 notebooks = Rs 4 x 96 = Rs 384
CP of 144 notebooks = Rs 4 x 144 = Rs 576
Gain on 96 notebooks = 10% of Rs 384 = Rs 38.4
Gain on 144 notebooks = 20% of Rs 576 = Rs 115.2
Total gain = Rs 38.4 + Rs 115.2 = Rs 153.6
Therefore gain percent= 153.6/960 x 100% = 16%(Ans)
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