Question

by selling 100 diwali cards a shopkeeper gains the s.p .of 40 cards .find his gain percent

Answer 1

gain = 40

$gain \% = \frac{gain \times 100}{cost \: price} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{40 \times 100}{60} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 66.66\%$