A stereo manufacturer determines that in order to sell x units of a new stereo, the price per unit, in dollars, must be p(x) = 1000 - x. The manufacturer also determines that manufacturing x units is given by C(x) = 3000 + 2x. total cost of Find the revenue function O RIX) = 1000x - x O none of the given options. O RIX) = 4000 +x O R(X) = 3000x + 2x