When sale of a unit increased from 20 unit to 35 units, the total revenue increased by ₹ 1,200. Calculate marginal revenue.

When price of a commodity rises from ₹5 to ₹6 per unit, total revenue increases form ₹1,000 to ₹ 1,200. Calculate its prices elasticity.

When the price of a commodity falls from 10 per unit to 9 per unit, total revenue from it falls from 1,200 to 918. Calculate its elasticity of supply?

The total revenue of a firm increased by ₹ 5,400, when his sale increased from 35 units to 50 units. Calculated marginal revenue of the firm.

The total cost of a firm increased by ₹ 450 , when production increased from 12 units of 15 units, Calculate marginal cost of the firm.