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If the interest rate is 3% compounded annually, how long will it take to earn $100 interest on an initial deposit of $300? [H

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Answer #1

Applying the CI formula,

CI = P(1+1o.) - P

Therefore, 100= 300(1+ 3/100)^n - 300

or, 400/300 =1.03^n

or, 1.03^n = 1.33

Applying n = 10, the equation gets satisfied.

Hence, the no. of years to earn $100 of interest on $300 is 10 years.

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