8. Naveen purchases 11 knives for 10 and sells them
at the rate 10 knives for 11. He earns a profit of 20
(a) 21% (b) 15%
(c) 11%
(d) 20%
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Step-by-step explanation:
cp of 1 knife = 10/11
sp of 1 knife = 11/10
profit =sp - cp
11 10 121-100 21
=__ - __ = _______ = ___
10 11 110 110
profit % = profit/cp × 100 = (21/110 ÷ 10/11 )×100
= 21/110 ×11/10 ×100 = 2100/100
=21%
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