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Mathematics 15 Online
OpenStudy (anonymous):

Lloyd opened a savings account 13 years ago with a deposit of $5,003.86. The account has an interest rate of 3.7% compounded daily. How much interest has Lloyd earned?

OpenStudy (anonymous):

calculate the value after 13 years, the difference between that and the initial deposit is the interest earned.

OpenStudy (anonymous):

So, 5003.86*13*0.037 which is 2406.86 5003.86-2406.86=2597 ?

OpenStudy (anonymous):

use the formula\[a=p(1+\frac{ r }{ n })^{nt}\]

OpenStudy (anonymous):

where r is the rate expressed in decimal, in this case....\[a=5,003.86(1+\frac{ 0.037 }{ 365 })^{365(13)}\]

OpenStudy (anonymous):

then subtract a-p, or the answer you get from that equation minus 5,003.86 and thats the interest rate. for anyone who needs help with this problem

OpenStudy (anonymous):

for the record, the formula you used is for simple interest, this one is compounded interest, because it says compounded daily

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