• # question_answer If 11 pencils are bought for Rs. 10 an 10 pencils are sold for Rs. 11, then what is the gain? A)  18%                 B)  16% C)  21%                 D)  10%

Selling price of 10 pencils = Rs. 11 SP of 1 pencil $=\,\,Rs.\,\,\frac{11}{10}$ SP of 11 pencils$=\frac{11}{10}\times 11=\,\,Rs.\,\,\,12.1$ Profit = Rs.$(12.1-0)=Rs.\,\,2.1$ Profit percentage$=\frac{2.1}{10}\times 100=21%$