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The annual interest rate for this note that would earn the interest of $160 is 8%.

In order to solve this problem, we have to use the interest rate formula

[tex]InterestRate = P*R *T[/tex]

where

  • P = Principal
  • R= Rate
  • T = Time

We divide 90 days by the total days in a year

= 90/365

= 0.2466

Principle * time

= 0.2466 * 8000 = 1972.6

The annual interest rate

= 160/1972.6

= 0.081

= 8%

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