Applying the equation :

Where, $\mathit{c}=$ Consumption expenditure $\left(8,000\right)$
$\overline{\mathrm{c}}=$ Autonomous consumption (500)
$\mathrm{b}=$ MPC (marginal propensity to consume)

$8,000=500+\mathrm{b}\times 10,000$
$8000=500+10,000\mathrm{b}$
$8000-500=10,000\mathrm{b}$
$7,500=10,000\mathrm{b}$
$\mathrm{b}=\frac{7,500}{10,000}$
$\mathrm{b}=0.75,\mathrm{MPC}=0.75$
Now,
$\mathrm{MPS}+\mathrm{MPC}=1$
$\mathrm{MPS}=1-\mathrm{MPC}$
$=1-0.75=0.25$
Hence, the value of MPS $=0.25$