A clothing business finds there is a linear relationship between the number of shirts,n

, it can sell and the price,p

, it can charge per shirt. In particular, historical data shows that1,000

shirts can be sold at a price of$30

, while3,000

shirts can be sold at a price of$14

. Find a linear equation in the formp(n)=mn+b

that gives the pricep

they can charge forn

shirts.