The Following Linear Demand Specification Is Estimated for Conlan Enterprises,a $Q = a + b P + c M + d P _ { R }$

The following linear demand specification is estimated for Conlan Enterprises,a price-setting firm: $Q = a + b P + c M + d P _ { R }$ where Q is the quantity demanded of the product Conlan Enterprises sells,P is the price of that product,M is income,and $P _ { R }$ is the price of a related product.The results of the estimation are presented below: Assume that the income is $10,000,the price of the related good is $40,and Conlan chooses to set the price of this product at $30.At the prices and income given above,Conlan can expect to sell _________units.

A) 342
B) 600
C) 724
D) 864
E) 872