Use the following general linear demand relation: $$Q _ { d } = 680 - 9 P + 0.006 M - 4 P _ { R }$$ where M is income and $$P _ { R }$$ is the price of a related good,R.If M = $15,000 and $P _ { R }$ = $20 and the supply function is $Q _ { 5 } = 30 + 3 p$ ,then,when the price of the good is $40,

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When the price is $40, the quantity demanded is 680 - 9(40) + 0.006(15000) - 4(20) = 500 units, and the quantity supplied is 30 + 3(40) = 150 units. Thus, there is a shortage of 500 - 150 = 350 units, not 180.

Use the Following General Linear Demand Relation Qd=680−9P+0.006M−4PRQ _ { d } = 680 - 9 P + 0.006 M - 4 P _ { R }Qd​=680−9P+0.006M−4PR​

Use the Following General Linear Demand Relation $Q _ { d } = 680 - 9 P + 0.006 M - 4 P _ { R }$