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You use the PRI formula
To calculate the time required to earn $6,000 in interest on a principal of $9,000 at an annual simple interest rate of 4.1%, use the formula ( I = P \times r \times t ). Rearranging the formula to solve for time ( t ) gives ( t = \frac{I}{P \times r} ). Plugging in the values: ( t = \frac{6000}{9000 \times 0.041} \approx 16.23 ) years. Therefore, it would take approximately 16.23 years to earn $6,000 in interest.
To calculate simple interest, you use the formula: Interest = Principal x Rate x Time. In this case, the principal is $6000, the interest rate is 7.39% (or 0.0739 in decimal form), and the time is 4 years. Plugging these values into the formula gives: Interest = $6000 x 0.0739 x 4 = $1774.80. Therefore, the simple interest on the loan would be $1774.80.
So you use the formula balance=principal(1+n over the number of years the the exponent ;0