Percentage Practice Test 5 with solutions

Initial price of the book = Rs 9
Increased price of the book = Rs 12.60
∴ Increase in the price of the book = Rs (12.60 - 9) = Rs 3.60
∴ Increase percentage in the price of the book, $\frac{3.60}{9}\times 100\%=40\%$
Hence, the required percentage $=\frac{\mathit{x}}{100+\mathit{x}}\times 100\%$
$=\frac{40}{100+40}\times 100\%$ $=\frac{40}{140}\times 100=28.54\%$