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You put $400 in an account. The account earns $18 simple interest in 9 months. What is the annual interest rate?

 Apr 8, 2021
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9 months is 3/4 of a year      

 

3/4 * x * 400 = 18      x is th interst rate per year

18/300 = x = 0.06       6%  annual simple interest

 Apr 8, 2021

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