36. The simple interest earned by a certain amount of money varies jointly as the rate of interest and the time (in years) that the money is invested. If the money is invested at 8% for 2 years, $80 is earned. How much is earned if the money is invested at 6% for 3 years?

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36. The simple interest earned by a certain amount of money  varies jointly as the rate of interest and the time (in years)  that the money is invested. If the money is invested at 8%  for 2 years, $80 is earned. How much is earned if the  money is invested at 6% for 3 years?  

Kaufmann, Jerome E.; Schwitters, Karen L.. Intermediate Algebra (p. 488). Cengage Learning. Kindle Edition. 

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