15. If Melody wants to purchase a house for $220,000 and finance $120,000 with either a 4%, 30-year mortgage or a 6%, 20-year mortgage. a. What is the effective interest rate on each of the above alternatives? b. Which alternative would you recommend and why? 16. Grace received a coin collection worth $60,000 from her uncle in Jan, 2020.If it was worth $10,000 in 1994, what is her uncle's rate of return on his investment (find Interest rate)