Suppose a product's revenue function is given by R(q) = - 6q2 + 600q , where R(q) is in dollars and q is units sold. Find the rate that revenue changes when 78 units are sold. Which best interprets your previous answer? (Choose one) O when 78 units are sold revenue decreases by $336 O revenue increases by 336 dollars per unit when 78 units are sold O revenue is decreasing by 336 dollars per unit when 78 units are sold O revenue decreases by 336 units per dollar when cost is $78 O 336 dollars are lost for each unit sold after 78 units