anonymous
  • anonymous
providing the formula would be helpful. John wishes to set up an account for his grandfather so that he can have some extra money each month. John wants his grandfather to be able to withdraw $140 per month for the next 4 years. How much must John invest today at 8% per year compounded monthly so that his grandfather can withdraw $140 per month for the next 4 years? a) $5,714.67 b) $5,764.67 c) $5,694.67 d) $5,734.67 e) $5,724.67
Statistics
schrodinger
  • schrodinger
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anonymous
  • anonymous
Well, for compounding interest, we have the formula: \[ I = Pr^t \]Where \(I\) is the interest made, \(P\) is the principle (initial amount of money), \(r\) is the interest rate, and \(t\) is the number of times it's compounding. Thought this problem will require a bit more thinking.
anonymous
  • anonymous
If you want the new ammount, it's just interest plug principle.\[ P+I = P(1+r)^t \]
mathstudent55
  • mathstudent55
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anonymous
  • anonymous
So John is making one investment which will generate 8% per year compounded monthly and his grandfather will start withdrawing $140 immediately upon the investment being made and each month after for the next 4 years?

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