If you are working on simple interest you have to write the equation I=p. r.t
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Time
You need to know the principal amount, the rate and the time. Then a very simply formula for calculating interest is I = PRT where P is the principal amount, R is the interest rate and T is the period of time in years.
Simple interset is the amount obtained by multiplying the principal by the rate, by the time.
68200*0.09*3=18414 note: have to move the rate to places over
time= interest/principal x rate likee yeahh thats it