High School Algebra Formulas

can someone check my work? (algebra review)?
What simple interest would be earned if 5,000 dollars is invested at 9 percent for 9 months?
i just need to know the formula for solving for simple interest. I would appreciate a little help on this one.
i havent had to many great techers in high school and im strugglin in the review part of algebra 101… HELPPPP!!!!
I=PRT
Interest=Principle*Rate*Time
X=5000*0.09*9/12
X=5000*0.09*0.75
X=337.50
9 divided by 12, because 12 months to a year, and only invested for 9 months
2AVMA08 / A08B04 – ProbleMATHics
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