A trader buys a chair for Rs. 600 and sells it for Rs. 765 at a credit of 4 months. Reckoning money worth 6% p.a, his gain percent is :
A student buys a pen for Rs. 90 and sells it for Rs. 100. Find his gain and gain percent.
Rajan buys a toy for Rs. 75 and sells it for Rs. 100 gain percent is
(a) 25%
(b) 20%
(c) 3313%
(d) 3712%