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 1 dozen note books = Rs.156
CP of 8 dozen notes = Rs. (156×8)
= Rs. 1248
SP of 8 dozen = 100+gain %/100×CP
= 110/100×1248
bsjwiw
CP of 8 dozen notes = Rs. (156×8)
= Rs. 1248
SP of 8 dozen = 100+gain %/100×CP
= 110/100×1248
bsjwiw
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