you have your choice of two investment accounts. investment a is a 20-year annuity that features end-of-month nkr12,000 payments and has an interest rate of 6 per cent compounded monthly. investment b is an 8 per cent continuously compounded lump sum investment, also good for 15 years. how much money would you need to invest in b today for it to be worth as much as investment a 20 years from now?