Find the term of the compound interest loan. () 4.9% compounded quarterly to obtain $8700 from a principal of $2000. yr. Use the "rule of 72" to estimate the doubling time (in years) for the interest rate, and then calculate it exactly, (Round your answers to two decimal places.) 6% compounded annually Rule of 72 Exact answer Find the effective rate of the compound interest rate or investment. () 23% compounded monthly