1. A monopolist faces the demand function : x= 10 - 2p

where x denotes sale and p denotes price. find the firm's revenue in terms of x also find the marginal revenue.

2. suppose cost of producing an output level x of a good is x^2+3x+10

find the marginal cost

3. Suppose the supply function for tea is q= -1+2p

where p denotes price and q denotes quantity supplied. find the elasticity of supply at points where p=1, 1.5 and 2

4. A country's imports M depend on its national income Y according to the relation M=7+0.2y + 0.05y^2

find the marginal prospensity to import