Refer to the figure below. If the original curves are MB1 and MC1, rational consumers will gather ________ units of information. 

A change in which variable will change the market demand for a product?

A) the price of the product B) population C) the prices of substitutes in production D) technology

If, at the firm's projected sales level, the marginal cost is $40, the average cost is $50 and the markup is 30 percent, then its selling price is

A) $40. B) $50. C) $52. D) $65.