I got question a correct, but question b is incorrect with 147 as an answer.

Please help me to find it out.

Consider a market where supply and demand are given by 0x5 = -16 + PX and Qxd = 83 ZPX. Suppose the government imposes a price floor of $40, and agrees to purchase and discard any and all units consumers do not buy at the floor price of $40 per unit. Instructions: Enter your responses rounded to the nearest penny {two decimal places). a. Determine the cost to the government of buying firms' unsold units. $ 840 b. Compute the lost social welfare (deadweight loss) that stems from the $40 price floor. $ 14