To calculate the 3/4% of 387, you have to use cross multiplication:
The fraction 3/4 can be expressed as a decimal value to make the calculations easier: 3/4=0.75
100% is 387
0.75% is x
Both relations are at the same ratio, so that
[tex]\begin{gathered} \frac{387}{100}=\frac{x}{0.75} \\ x=\frac{387}{100}\cdot0.75 \\ x=2.9025 \end{gathered}[/tex]This means that the 3/4% of 387 is 2.9025