$\text { Rate of discount }=5 \% $
$\text { Discount given }=\frac{5}{100} \times 1000=\text { Rs. } 50 $
$\text { Discounted price }=(1000-50)=\text { Rs. } 950 $
$\text { Rate of GST }=5 \% $
$\text { Total GST }=\frac{\text { Rate OfGST }}{100} \times \text { Discounted Price } $
$\Rightarrow \text { Total GST }=\frac{\frac{1}{5}}{100} \times 950=\text { Rs. } 47.50 $
$\text { Purchase Price }=(950+47.5)=\text { Rs. } 997.50$

