Profit and Loss Practice Test 7

Let CP of 100 kg of goods = Rs 100
But the trader buys 101 kg for Rs 100.
So, the CP of 100 kg of goods $\frac{100\times 100}{101}=\frac{10000}{101}$
SP of 100 kg of goods = Rs 100
But trader sells 99 kg instead of 100 kg.
So, SP of 99 kg = Rs 100
SP of 100 kg = Rs $\frac{10000}{99}$
Profit per cent $=\frac{\frac{10000}{99}-\frac{10000}{101}}{\frac{10000}{101}}\times 100=2.02\%$