SOLUTION: Suppose you pay back $510 on a $500 loan. You had the loan for 45 days. What was your simple annual interest rate?

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Question 1063253: Suppose you pay back $510 on a $500 loan. You had the loan for 45 days. What was your simple annual interest rate?
Found 2 solutions by ankor@dixie-net.com, MathTherapy:
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Suppose you pay back $510 on a $500 loan.
You had the loan for 45 days.
What was your simple annual interest rate?
:
You paid $10 in interest
10%2F500 = .02; 2% for 45 days
Find the annual rate
365%2F45 * 2 = 16.2%

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!
Suppose you pay back $510 on a $500 loan. You had the loan for 45 days. What was your simple annual interest rate?
SI = PTR
Note that number of days used for these types of calculations is 360, not 365 like most people think
510+-+500+=+500+%2A+%2845%2F360%29+%2A+R
10+=+500+%2A+%281%2F8%29+%2A+R
10+=+500R%2F8
500R = 80 ------- Cross-multiplying
R, or annual interest rate is: highlight_green%28matrix%281%2C5%2C+80%2F500%2C+or%2C+.16%2C+%22=%22%2C+%2216%25%22%29%29