In: Finance
For the last 12 years, you deposited a certain amount of money each week into a bank account whose annual rate is 1.9% with weekly compounding. If the account has $74,665 today, how much interest has the account earned?
| Step-1:Calculation of weekly deposit | ||||||||
| Weekly deposit | = | Future value of weekly deposit | / | Future value of annuity of 1 | ||||
| = | $ 74,665 | / | 700.7219 | |||||
| = | $ 106.55 | |||||||
| Working: | ||||||||
| Future value of annuity of 1 | = | (((1+i)^n)-1)/i | Where, | |||||
| = | 700.721945 | i | = | 1.9%/52 | = | 0.000365 | ||
| n | = | 12*52 | = | 624 | ||||
| Step-2:Calculation of interest earned | ||||||||
| Future value of deposit | = | $ 74,665 | ||||||
| Total deposit | = | $ 106.55 | * | 624 | = | $ 66,490 | ||
| Interest earned | $ 8,175 | |||||||