Use I = PRT to solve. (time in years)
P= $400
R= 9%
T= 0.25 years Find I

(remember, 9% = 0.9 in decimal form

Simple interest is $ 9

Solution:

Given that,

P = $ 400

T = 0.25 years

The formula for simple interest is:

Where,

I is the simple interest earned

R is the rate of interest in decimal

T is the number of years

Substituting the values we get,

Thus simple interest is $ 9

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