Given
Interest earned: $72.00
Principal: _?
Interest rate: 12%
Time: 3 years
Procedure
I=P*r*t
P = Principal Amount
I = Interest Amount
r = Rate of Interest per year
t = Time Period involved in months or years
[tex]\begin{gathered} I=P\cdot r\cdot t \\ 72=P\cdot0.12\cdot3 \\ \frac{72}{3\cdot0.12}=P \\ 200=P \end{gathered}[/tex]The answer is 200