A store sells a certain type of digital camera. The revenue from selling x cameras is modeled by  R(x) = 420x − 0.5x2.  The cost of producing x cameras is modeled by  C(x) = 9600 + 150x − 0.1x2.  These models are valid for x in the interval [0, 600]. (a) Find a function P(x) that models the profit from producing and selling x cameras. P(x)  =        How many cameras must be sold in one week before revenue exceeds cost. (Round your answer up to the nearest whole number.)  cameras

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