If I purchased 11 books for Rs. 100 and sold 10 books for Rs. 110, the percentage of profit per book sold is
Cost price of 1 book = Rs. $$\frac{100}{11}$$
Selling price of 1 book = Rs. $$\frac{110}{10}=11$$
=> Profit % = $$\frac{11-\frac{100}{11}}{\frac{100}{11}}\times100$$
= $$\frac{\frac{121-100}{11}}{\frac{100}{11}}\times100$$
= $$\frac{21}{100}\times100=21\%$$
=> Ans - (D)
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