A radio commercial for a loan company states: “You only pay $0.29 a day for
each $500 borrowed.” If you borrow $1,500 for 120 days, what amount will you
repay, and what annual interest rate is the company actually charging?
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OpenStudy (cruffo):
First - If they charge $0.29 a day for $500, how much will they charge per day for $1500?
OpenStudy (anonymous):
0.87?
OpenStudy (cruffo):
Correct: 3*500 = 1500 so 3*0.29 = 0.87.
Next - If you get charged $0.87 per day, what is the total charge for 120 days?
OpenStudy (anonymous):
104.4
OpenStudy (cruffo):
Awsome! 0.87 * 120 = 104.4
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OpenStudy (cruffo):
So the amount you repay is equal to the amount you borrowed plus the additional fee:
1500 + 104.40 = ??
OpenStudy (cruffo):
yep!
OpenStudy (anonymous):
wow LOL thanks so muvh my brain really isnt working tonight hahah
OpenStudy (cruffo):
word problems :(
OpenStudy (anonymous):
lol real talk
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OpenStudy (cruffo):
The last part, I'm not to sure about: "and what annual interest rate is the company actually charging?"
OpenStudy (anonymous):
ya same. i was thinking a=p(1+rt) 1604.4=1500(1+r*(120/365)
OpenStudy (cruffo):
Hum. then solve for r?
I was thinking: 0.29 = x% of 500. Then solving for x, looks like you pay 0.058% per day. Multiply by 365, to get 21.17%
OpenStudy (anonymous):
it comes out to the exact same answer:)
OpenStudy (cruffo):
Yah! cool.
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OpenStudy (anonymous):
omg thanks you've been a big help! have a good night:)