𝑅𝑀 600 is deposited every three months for two years and nine months at
8 % compounded quarterly.
i. Find the future value of this annuity at the end of investment period.
ii. Calculate the interest earned
Don't you have a formula for annuity future value? Just plug in your numbers.
The only wrinkle is that you need to divide the interest rate by 4, and multiply the periods by 4.