The Pear company sells pPhones. The cost to manufacture a pPhones is C(a) = -27ac + 54000xc + 21740 dollars (this includes overhead costs and production costs for each pPhone). If the company sells a pPhones for the maximum price they can fetch, the revenue function will be R(a) = -35x + 246000x dollars. How many pPhones should the Pear company produce and sell to maximimze profit? (Remember that profit=revenue-cost.) X=