Chetan's investment in a Registered Retirement Savings Plan (RRSP) at an interest rate of 4.35% compounded semi-annually had grown to $24,000 at the end of one year. Thereafter, the interest rate on his RRSP dropped to 3.75% compounded monthly and remained constant for the next two years. Calculate his original investment in the RRSP and the accumulated amount at the end of three years (two years after the rate drop).