Riverside appliances is marketing a new refrigerator. it determines that in order to sell x refrigerators, the price per refrigerator must be begin mathsize 20px style bold italic p bold equals bold 280 bold minus bold 0 bold. bold 4 bold italic x end style. it also determines that the total cost of producing x refrigerators is given by begin mathsize 20px style bold italic c open parentheses bold x close parentheses bold equals bold 5000 bold plus bold 0 bold. bold 6 bold italic x to the power of bold 2 end style. what is the maximum profit?