Answer:
d. None of the above = $24,118.96 is the interest accumulated set at 2.15% interest.
Step-by-step explanation:
2400 x 20 x 1.0215^19 = 71906.8535769
plus + 400 x 1.0215^20= 612.107091074 the answer is 72518.960668 saved after 20 years
72518.960668- 48400 =24118.960668
rounded to 2dp = $24,118.96 interest.