If the future value of a one-period investment is given by the formula, F = I + (I R), what is the formula for the amount of the investment, I? I = F/(1 + R) I = F - (1 R) I = F x (1 R) I = F x (1 + R) 2. The opposite process rule says to solve for ________. a known variable by replicating the process used to form the original equation an unknown variable by reversing the process used to form the original equation an unknown variable by replicating the process used to form the original equation a known variable by reversing the process used to form the original equation