$$ \begin{aligned} \frac{(10000 \times 100\%) \times (1 - 75\%)}{(10000 \times 100\%) \times (1 - 0\%)} = 0.25 \end{aligned} $$
$$ \begin{aligned} \frac{(10000 \times (100\% - 75\%)) \times 1}{(10000 \times (100\% - 0\%)) \times 1} = 0.25 \end{aligned} $$
$$ \begin{aligned} \frac{(18510 \times 180\% + 22055 \times 180\%) \times (1 - 75\%) }{(18510 \times 180\% + 22055 \times 180\%) \times (1 - 0\%)} = 0.25 \end{aligned} $$
$$ \begin{aligned} \frac{(18510 \times (180\% - 75\%) + 22055 \times 180\%) \times 1}{(18510 \times (180\% - 0\%) + 22055 \times 180\%) \times 1} = 0.8098 \end{aligned} $$