Answer:
Annual deposit= $5,539.52
Explanation:
First, we need to calculate the total worth of the 4 years tuition 18 years from now:
FV= PV*(1+i)^n
Year 1= 20,000*1.05^18= 48,132.39
Year 2= 48,132.39*1.05= 50,539
Year 3= 50,539*1.05= 53,065.95
Year 4= 53,065.95*1.05= 55,719.25
Total FV= $207,456.59
Now, using the following formula we can determine the annual deposit:
FV= {A*[(1+i)^n-1]}/i
A= annual deposit
Isolating A:
A= (FV*i)/{[(1+i)^n]-1}
A= (207,456.59*0.08) / [(1.08^18) - 1]
A= $5,539.52