How would i solve this...

Louis opened a savings account 15 years with a deposit of $2,705.76. The account has an interest rate of 3.9% compounded twice a year. How much interest has Louis earned?

what would the formula look like?
and what is the number for "twice a year"?

Question

How would i solve this...

Louis opened a savings account 15 years with a deposit of $2,705.76. The account has an interest rate of 3.9% compounded twice a year. How much interest has Louis earned?

what would the formula look like?
and what is the number for "twice a year"?

parthkohli · Answer

Well if it's like half years, then 15 years = 30 half years.

parthkohli · Answer

Do you know the formula for continuous compounding?

anonymous · Answer

no

parthkohli · Answer

It's something like if you're compounding 5% of 100 every year, then you'll have:

$\Large \color{MidnightBlue}{\Rightarrow 100(1 + 5\%)^{years} }$

anonymous · Answer

so

P(1+R/2)^2*15?

parthkohli · Answer

If you want to see the interest, then you will have to subtract the principal from the amount.

parthkohli · Answer

And no.

parthkohli · Answer

$\Large \color{MidnightBlue}{\Rightarrow 2,705.76(1 + 3.9\%)^{30} }$

parthkohli · Answer

Remember that I put 30 because of half years

anonymous · Answer

OK I GOT IT THANKS