2) A company produces and sells smartphones. The revenue for one smartphone is $900. The cost to produce x smartphones is given by C() = 0.001x3 - 0.003x2 + 0.015x + 90000 dollars. a) How many smartphones must be produced and sold to maximize the profit? Round the answer to the nearest whole number. smartphones b) Using this number of smartphones, what is the maximum profit? Round your answer to the nearest dollar. dollars