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Mathematics 9 Online
OpenStudy (anonymous):

Moxie wants to have $5000. How much money does she have to deposit in an account at 6% interest, compounded 3 times per year, in order to have $5000 at the end of 6 years?

OpenStudy (jack1):

Future amount = Present Amount × (1+r)^n

OpenStudy (jack1):

your future amount is 5000 r is the interest rate as a decimal n is the number of periods

OpenStudy (jack1):

can you solve that...? @jacky27

OpenStudy (jack1):

... so your interest rate is 6%... which is 0.06 as a decimal and the number of periods is 3 per year, for 6 years = 3 x 6 = 18 so... \[5000 = deposit \times (1+0.06)^{18}\]

OpenStudy (jack1):

now just solve for deposit

OpenStudy (anonymous):

after solving (1+0.06)^18 do you divide by 5000?

OpenStudy (jack1):

no, to get the 1.06^18 to the other side, divide both sides of the equals sign by 1.06^18 this will isolate the deposit, and give u your answer

OpenStudy (jack1):

dammit, hang on, sorry, the interest rate they gave you would most likely be the "annual" interest rate, not the rate every 4 months, the rate you should use in your calculations is more likely to be 0.02, not 0.06... though it dosent specify exactly...

OpenStudy (jack1):

anyway, use 0.02 as r, not 0.06

OpenStudy (anonymous):

so it would be (1+0.02)^18 ?

OpenStudy (jack1):

yep which equals approx 1.428, so divide both sides by 1.428 = necessary deposit amount

OpenStudy (jack1):

so what was your final answer...?

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