Question

In: Economics

You deposit today $3100 dollars in an account that pays 4.8 percent per year. For the...

You deposit today $3100 dollars in an account that pays 4.8 percent per year. For the next few years you will keep making deposits 7.1 percent larger than the previous one. What will be the balance on the account after 15 deposits. I feel like I am missing the annuity to solve this problem, but I could be wrong.

Solutions

Expert Solution

Today I deposit $3,100. Which earns return annually at 4.8%. Thus in the first year the return is $149. 3100*4.8% 3100+149 = 3249.

Every year I go on depositing and I increase the deposit by 7.1%. Thus 3100*(1.071) = 3320. After the 2nd deposit the balance will be 3249 which is the amount deposited plus the interest, and in that year I deposit 3320. Thus the balance will be previous years interest earned income plus this years deposit. Which is $6569 (3320+3249). The interest on that will 6569(1.048) = $6,884

Deposit Total balance (Deposit plus previous years return) Return
Initial deposit 3100 3249
3320 6569 6884
3556 10440 10941
3808 14749 15457
4079 19536 20474
4368 24842 26035
4678 30713 32187
5011 37198 38983
5366 44350 46478
5747 52226 54733
6155 60888 63811
6592 70403 73782
7060 80843 84723
7562 92285 96715
8099 104813 109844

Thus the balance would be $109844 including return.

Not including return it would be $104813


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