(a) If $20,000 is now borrowed from a bank and repay by monthly payment for two years. The bank charges a flat rate of 0.5% per month. Calculate the amount of interest for this loan. (b) Dr. Chin deposits S6,000 in advance, and then withdrawn SX after five years. The accumulated value of the deposit becomes S5,000 after ten years. (i) Determine X if the effective interest rate is 4% pa. (ii) Determine the yield rate if X is 7,000. (c) An amount of $2,000 is invested at the end of each month for 25 years. At the end of the 25th year, this fund will accumulate to $1,000,000. Determine the effective interest rate b Newton-Raphson method, correct to 6 decimal places