You invest B, dollars in an account that draws interest at a monthly rate of r as a decimal, compounded monthly. Aft B = B (1 + r) (a) Let a denote the APR as a decimal. Then the monthly rate as a decimal is equal to a divided by 12. Express the a decimal. B(1) = (b) Let a denote the APR as a decimal, and let A denote the APR as a percentage. Then a is equal to A divided by 1 and the APR as a percentage. B(t) = (c) Note that y years is equivalent to 12y months. Express the balance in terms of the initial investment, the numb B(Y) ecimal, compounded monthly. After t months, the balance in dollars is given by the following. ual to a divided by 12. Express the balance in terms of the initial investment, the number of months, and the APR as . Then a is equal to A divided by 100. Express the balance in terms of the initial investment, the number of months, of the initial investment, the number y of years, and the APR as a percentage