Tamara invests $30,000 in an account earning 7% interest per year over the next 4 years. How much (simple) interest will her investment earn in total? i got 100 x 30,000 = 2100 x 4 yrs = $8400
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$\displaystyle I = \frac{PRT}{100}= \frac{30,000\times 7 \times 4 }{100}= \dots$
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