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How much should you invest at 
3.1% simple interest in order to earn 
$75 interest in 10 months?

How much should you invest at 3.1% 3.1 \% simple interest in order to earn $75 \$ 75 interest in 1010 months?

Full solution

Q. How much should you invest at 3.1% 3.1 \% simple interest in order to earn $75 \$ 75 interest in 1010 months?
  1. Understand Formula and Values: Understand the formula for simple interest and identify the known values.\newlineSimple interest can be calculated using the formula I=PRTI = PRT, where II is the interest earned, PP is the principal amount (initial investment), RR is the annual interest rate (as a decimal), and TT is the time in years.\newlineWe know the following:\newlineII (Interest) = $75\$75\newlineRR (Annual Interest Rate) = 3.1%3.1\% or 0.0310.031 (as a decimal)\newlineTT (Time) = II11 months or II22 years\newlineWe need to find PP (Principal).
  2. Convert Rate and Time: Convert the annual interest rate to a decimal and the time into years. \newlineR=3.1%=0.031R = 3.1\% = 0.031 (as a decimal)\newlineT=10T = 10 months =1012= \frac{10}{12} years
  3. Rearrange Formula for P: Rearrange the simple interest formula to solve for P (Principal).\newlineThe original formula is I=PRTI = PRT.\newlineTo solve for P, we rearrange the formula to P=I(RT)P = \frac{I}{(RT)}.
  4. Substitute Values for P: Substitute the known values into the rearranged formula to calculate P.\newlineP=$750.031×1012P = \frac{\$75}{0.031 \times \frac{10}{12}}
  5. Perform Calculation: Perform the calculation.\newlineP=$750.031×1012P = \frac{\$75}{0.031 \times \frac{10}{12}}\newlineP=$750.031×56P = \frac{\$75}{0.031 \times \frac{5}{6}}\newlineP=$750.031×0.8333P = \frac{\$75}{0.031 \times 0.8333\ldots}\newlineP=$750.0258333P = \frac{\$75}{0.0258333\ldots}\newlineP$2903.23P \approx \$2903.23

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