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1 40,000 (5 +x)2 ' represents hundreds of calculators and revenue is in dollars. Find the total revenue function for these calculators. where x ' The marginal revenue for a new calculator is given by m = 90,000 The rate of production of a new line of products is given by d_x = 400 1+ L02 df (r + 60) where x is the number of items produced and t is the number of weeks the product has been in production. Assuming that x = 0 when t = 0, nd the total number of items produced as a function of time t