Verified Answer :

hartnn

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 = 400r3/4

r =  0.06
so the annual interest rate is 0.06 or 6%.

Answer:

0.06 or 6%

Step-by-step explanation:

I=Prt, so r= 1/(Pt)

T= 9 months/12 months=0.75

R=$18/($4000.75)=0.06 or 6%

Note the is times

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