Suppose the weekly demand function for a pound of the house blend coffee at a local coffee shop is p $=15-.$where p is the current price per pound and q is the quantity sold

$($a$)$ If the current price is $$11\mathrm{.}25$ per pound, how much coffee is sold each week?

$($b$)$ If they are selling $180$ pounds of coffee each week, what is the current price?

$($c$)$ If the owner wants to sell $300$ pounds of coffee each week, what should the price be$?$