At the end of 4 years, she will have $54933
Explanation:
Given-
Time to buy a new laptop, n = 4years
Quarterly deposit, C = $100 X 4 = $400 per year
Pays 3% per year compounded quarterly
We have to find the future value of Annuity
[tex]FV = C * [\frac{(1 + i)^n - 1}{i} ][/tex]
Where, C = cash flow
i = interest rate
n = number of deposits
[tex]FV = 400 [ \frac{(1 + 3/400)^4}{3/400} ]\\\\FV = 400 [ \frac{1.03}{0.0075} ]\\\\FV = 400 * 137.33\\FV = 54933[/tex]
At the end of 4 years, she will have $54933