Alex deposited RM 2000 into his own bank account (assuming at t=0). Roy deposited RM 1200 into his own bank account at the same time as Alex. Each account earns an effective interest rate of i. If the amount of interest (amount X) earned by Alex in the 10th year is equal to the amount of interest earned by Roy in 15th year. i) Find the amount X. ii) What is the total accumulated amount in both Alex and Roy accounts in 20th year, if no withdraw was made during the period?