7) a) An investment of $2112.33 earns interest at 6.8% per annum compounded annually for 3 years. At that time, the interest rate is changed to 8% compounded quarterly How much will the accumulated value be 3.5 years after the change? The accumulated value is S! (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) b) Find the proceeds of a non-interest-bearing promissory note for $75,000 discounted 42 months before maturity at 6.5% compounded semi-annually. The present value is $! (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)