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16) 6%

17) 4 years

18) 2 years

Step-by-step explanation:

The formula for these questions is I = PRT

16) 27 = 900 (R) (0.5)

Notice how I used 0.5 instead of 6 for the T. T has to be measured in years, not months and 6 months is half a year.

R = 0.06 = 6 %

17) 480 = 2000 (0.06) (T)

T = 4 years

18) 1080 = 4500 (0.12) (T)

T = 2 years

the correct answer to your question is a. 4^4

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