The Wilson Company's marketing manager has determined that the price elasticity of demand for its products equals -2.2. according to studies she carried out, the relationship between the amount spent by the firm on advertising and its sales is as follows
Advertising Expenditures Sales
$100,000 $1.0 million
200,000 1.3 million
300,000 1.5 million
400,000 1.6 million
a. If the Wilson Company spends $200,000 on advertising, what is the marginal revenue from an extra dollar of advertising?
b.Is $200,000 the optimal amount for the firm to spend on advertising?
c.If $200,000 is not the optimal amount, would you recommend that the firm spend more or less on advertising?