Q. How much should you invest at 3.1% simple interest in order to earn $75 interest in 10 months?
Understand Formula and Values: Understand the formula for simple interest and identify the known values.Simple interest can be calculated using the formula I=PRT, where I is the interest earned, P is the principal amount (initial investment), R is the annual interest rate (as a decimal), and T is the time in years.We know the following:I (Interest) = $75R (Annual Interest Rate) = 3.1% or 0.031 (as a decimal)T (Time) = I1 months or I2 yearsWe need to find P (Principal).
Convert Rate and Time: Convert the annual interest rate to a decimal and the time into years. R=3.1%=0.031 (as a decimal)T=10 months =1210 years
Rearrange Formula for P: Rearrange the simple interest formula to solve for P (Principal).The original formula is I=PRT.To solve for P, we rearrange the formula to P=(RT)I.
Substitute Values for P: Substitute the known values into the rearranged formula to calculate P.P=0.031×1210$75
Perform Calculation: Perform the calculation.P=0.031×1210$75P=0.031×65$75P=0.031×0.8333…$75P=0.0258333…$75P≈$2903.23
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