A student buys a pen for Rs 90 and sells it for Rs 100. Find his gain

1.	A student buys a pen for Rs 90 and sells it for Rs 100. Find his gain and gain percent.
Answer» Cost price of pen = Rs. 90 Selling price of pen = Rs. 100 Hence, Gain = selling price – cost price = 100 – 90 = Rs. 10 Gain% = \(\frac{gain}{cost\,price}\) x 100 = \(\frac{10}{90}\) x 100 = \(\frac{100}{9}\) = \(11\frac{1}{9}\)%

A student buys a pen for Rs 90 and sells it for Rs 100. Find his gain and gain percent.

Answer»

Cost price of pen = Rs. 90

Selling price of pen = Rs. 100

Hence,

Gain = selling price – cost price = 100 – 90 = Rs. 10

Gain% = \(\frac{gain}{cost\,price}\) x 100 = \(\frac{10}{90}\) x 100 = \(\frac{100}{9}\) = \(11\frac{1}{9}\)%