A firm earns a revenue of Rs 60 when the price is Rs 10. When the price increases to Rs 15, the revenue becomes Rs 120. What is the elasticity of supply?
Sakshi invests a part of Rs. 12,000 in 12% stock at Rs. 120 and the remainder in 15% stock at Rs. 125. If her total dividend per annum is Rs. 1360, how much does she invest in 12% stock at Rs. 120?