Need help finding simple interest rate with the equation below

Mathematics
Tutor: None Selected Time limit: 1 Day

April borrowed $450 from her parents for a stereo. She paid it back at the end of 2 months with a simple interest rate of 9%. How much interest did she pay her parents?

May 7th, 2015

9% interest is annual. So, 9/12 = 0.75% interest per month

Then April paid back (2)(0.0075)(450) = $6.75 in interest

May 7th, 2015

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