SAT Math · Nonlinear functions · easy

The value of an investment, in dollars, after t years is modeled by V(t) = 5000(1.06)^t. According to this model, by what percent does the…

The value of an investment, in dollars, after tt years is modeled by V(t)=5000(1.06)tV(t) = 5000(1.06)^t. According to this model, by what percent does the investment's value increase each year?

Answer and explanation

Answer: B: 6%

In an exponential model V(t)=V0btV(t) = V_0 b^t, the base bb is the growth factor per year. Here b=1.06=1+0.06b = 1.06 = 1 + 0.06, so each year the value is multiplied by 1.06, an increase of 6%. That is choice B. Choice A (106%) is the percent of the previous value that remains, not the increase. Choice C (1.06%) misreads the decimal as a percent. Choice D (60%) shifts the decimal point the wrong way. Subtract 1 from the base and convert the decimal to a percent: 0.06=6%0.06 = 6\%.

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