Let, Primary defict = x
₹10,000 crores = 40% of x = 0.40 x
x= ₹10,000 crores / 0.40 = ₹25,000 crores
Primary Deficit = Fiscal deficit – Interest payment
₹25,000 crores = Fiscal defict – ₹10,000 crores
Fiscal deficit = ₹25,000 crores + ₹10,000 crores
= ₹35,000 crores