Question

A shopkeeper gains the cost of 8 metres thread by selling 40 metres thread. Find his gain percent.

• A. 19%
• B. 20%
• C. 22%
• D. 16%
• E. None of these

Answer 1

The correct option is B 20%

Here, m =48, n =40.
$\therefore$ Gain %$=\left(\frac{m-n}{n}\right)\times 100=\left(\frac{48-40}{40}\right)\times 100$
$=\frac{8}{40}\times 100=20\%$