Hello Dinesh,
If this is correctly defined in the material master MRP1, the total quantity should be the quantity before scrapping.
In your case if you want to produce 100 kg, production order should start with total quantity of 110 kg
Scrap percentage = scrap portion / (Total quantity - scrap portion) %
Example:
Total quantity Scrap portion Scrap percentage
50 10 25.00 %
100 10 11.11 %
110 10 10.00 %
Regards