$.$ A stock is currently sold for $$500$ and is expected to be worth $$700$ in $5$ years. Calculate the expected return. $(3$ marks$)$ ii$.$ A teacher is planning to spend $$12,500$ at the end of every year at the time of his retirement which is planned for $15$ years. Assuming a rate of interest of $8\%$ per annum, calculate the amount he has to save to be able to realise his plan. $(3$ marks$)$ iii. John has been offered a loan amounting $$200,000$ at an Annualised percentage rate of $6\%$ for a period of $25$ years to be repaid on a monthly basis. Calculate his monthly payment.