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 (both in millions of dollars) are functions of the years past 1990. R(E) - 21.40.134 and c(t) = 18.601311 (a) Use the models to predict the company's profit in 2021. (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.) X years after 1990