For the given word problem determine the correct formula to use. Also, determine the value of each variable. If the variable is not needed for this formula, select that choice. If the variable is the unknown value that is being asked for, select that choice. Each year you invest $2000 into an annuity that earns a rate of 4.2% compounded annually. How much do you have in the account after investing for 28 years? What is the value of r that will be plugged into the formula? A.4.2 4.2 B.0.042 0.042 C.28 28 D. 1 E. $2000 F.0.42 0.42 G. 12 H. 2 I. r is not needed for this formula. J. r is the unknown variable