Discussion Chapter $7$

Do Qs $85$ and $86$ page $462$

$85.$ Producers' and Consumers' Surplus Suppose that the supply function for sone commodity is

$S(q)=q^2+5q+100$

and the demand function for the commodity ls

$D(q)=350-q^2$

$($a$)$ Find the producerst surplus

$($b$)$ Find the consumers surplus

$86.$ Not Savings A company hit in walled uew machinery that wil produce a saving state in thou e d dof dollar per year$)$ of

$s(x)=2x^{2}5-x^2$

where is the number ol yeis the inactilery is to ke used the rete of addtional costs $($on thou sand so dollars per y war$)$ to the compuny due lo lie new monthiner, k cxpected to be