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HACTEHA [7]
2 years ago
6

you put $400 in an account. the account earns $18 simple intrest in 9 months. what is the anual interest rate?

Mathematics
2 answers:
mojhsa [17]2 years ago
8 0

Use the formula,

I = Prt

P = Principal amount = 400

I  = interest = 18

r = annual rate

t = time in years = 9/12 = 3/4


so,

18 = 400*r*3/4


r =  0.06

so the annual interest rate is 0.06 or 6%


meriva2 years ago
7 0

Answer:

6%

Step-by-step explanation:

I = Prt, so r = I / (Pt)

t = 9 months / 12 months = 0.75

r = $18 / ($400 * 0.75) = 0.06, or 6%

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