A manufacturoc has been selling 1850 televisions a week at $420 each. A market survey indicates that for each $12 discount offered to a buyer, the total number sold will increse by 120 TVs per week. We will define the variable 'a' to represent the number of $12 discounts that are offered. Wo will allow 'a' to be any real number, including decimal values. Find the function p(a) which gives the price of a TV in dollars.