If the price elasticity of demand is unit, then a fall in price:
Reduces revenue
Leaves revenue unchanged
Increases revenue
Reduces costs
This means the percentage change in quantity demanded equals the percentage change in price. So, price changes will not alter the revenue.
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?