Nhlanhla made an initial deposit of R20 000 into an investment account that paid interest at the rate of \(7,2 \%\) p.a., compounded quarterly. After 2 years the interest rate changed to \(7,8 \%\) p.a., compounded monthly. Four years after his initial deposit, Nhlanhla withdrew R2 500 from his investment.

1. Calculate how much Nhlanhla had in this investment account 2 years after the initial deposit was made.

2. How much will the investment be worth 7 years after the initial deposit was made?