The revenue per month earned by the Couture clothing chain at time t is R(t) = N (t)S (t). where N (t) is the number of stores and S (t) is average revenue per store per month. Couture embarks on a two-part campaign: to build new stores at a rate of 12 stores per month and to use advertising to increase average revenue per store at a rate of $10,000 per month. Assume that N (0) = 50 and 5(0) = $150,000. Compute the total revenue increase. (Use symbolic notation and fractions where needed. Write S (t) as S and N (t) as N.) dR Calculate E F0. (Give your answer as a whole or exact number.)