Naveen purchases 11 knives for Rs. 10 and sells them at the rate 10 knives for Rs. 11. He earns a profit of
21%
15%
11%
20%
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Answer:
C.P. of 1 knife =11/10
S.P of 1 knife =10/11
Profit = S.P − C.P
Profit =10/11−11/10=121−100/110=21/110
Profit % =profit/C.P×100
Profit % =21/100/10/11 ×100
⇒21/110×11/10×100=21 %
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