At each stage of sale of the machine , there is an Inter-state transaction. So, the rate of GST on each transaction of machine is 28%.
For the Manufacturer :
MP = ₹5000 and discount = 20% of ₹5000.
Discount = 20100×5000 = ₹1000
∴ SP = MP - Discount
= ₹5000 - ₹1000 = ₹4000
For the Wholesaler :
CP = ₹4000
Discount = 10% of MP
Discount = 10% of ₹5000 = 10100×5000 = ₹500
SP = MP - Discount = ₹5000 - ₹500 = ₹4500
∴ Net Tax Liability of the wholesaler to the Central Government = Output Tax - Input tax credit
= Tax on SP - Tax on CP
= 28% of ₹4500 - 28% of ₹4000
= 28% of ₹500
= 28100×500 = ₹140