What rate of interstis required so that $1000 will yield $1900 after 5 years if the interset rate is compounded monthly. And I got 12.9%
Now How long will it take a sum of money to triple if it is invested at 10% compounded daily

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there is a formula for this. do you know it / did you use it for the first question?

yes
it is A=P(1+r/n)^nt

ok so:
r = .10
n = 365
A = 3*P
\[3*P = P*(1+\frac{.1}{365})^{.1*t}\]solve for t.

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