[tex]\huge\boxed {\: I=\frac{PRT}{100}}[/tex]
First, we'll have to multiply the principal amount, rate of interest and time period.
[tex]12500 \times 10 \times 3[/tex]
[tex] = 375000[/tex]
Now, divide the amount ( 375000 ) by 100.
[tex] = \frac{375000}{100} [/tex]
= $3750
Hence, the simple interest is $3750