pls answer this

What are the rules?

use 75 25 50 100 5 2 to find 431

$\begin{array}{|lrcll|} \hline 1. & \left(\dfrac{2}{25}+5 \right)*75 +50 \\ \hline 2. & \left(\dfrac{2}{25}+5 \right)*75 +100 -50 \\ 3. & \left(\dfrac{2+50}{25}+5\right)*75 -100 \\ \hline \end{array}$

 75   25   50   100   5   2   to find 431

75*5 + 50  + (100/25) + 2

375 + 50  +  4  + 2   =

425  + 4 +  2  =

431