An investment services company experienced dramatic growth in the last two decades. The following models for the company's revenue R and expenses or costs C (both in millions of dollars) an functions of the years past 1990. R(t)=21.4e0.131 and C(t) = 18.660.131 (a) Use the models to predict the company's profit in 2029. (Round your answer to one decimal place.) $ x million (b) How long before the profit found in part (a) is predicted to double? (Round your answer to the nearest whole number.) Xyears after 1990