A manufacture has been selling 1500 television sets a week at 360 each. A market survey indicates that for each 15 rebate offered to a buyer, the...

A manufacture has been selling 1500 television sets a week at 360 each. A market survey indicates that for each 15 rebate offered to a buyer, the number of sets sold will increase by 150 per week. a) Find the demand function , where is the number of the television sets sold per week.