It is a case of intra-state transaction of goods and services:
SGST = CGST = $\frac{1}{2} \times$ GST
Given:
Listed Price of article by manufacturer = ₹1600
Discount percentage given by manufacturer to wholesaler = 25%
Cost Price for wholesaler = Listed Price - Discount
$$\begin{aligned}= 1600 - \Big(\frac{25}{100}\times1600\Big) \\[0.5em] = 1600 - 400 \\[0.5em] = ₹1200\end{aligned}$$
As the sales are intra-state and the rate of GST is 5%, so GST comprises of 2.5% as CGST and 2.5% as SGST. Manufacturer sells the article to wholesaler for ₹1200, amount of GST collected by manufacturer from wholesaler(or paid by wholesaler)
CGST = 2.5% of 1200 = $\frac{2.5}{100} \times$ 1200 = ₹30
SGST = 2.5% of 1200 = $\frac{2.5}{100} \times$ 1200 = ₹30
∴ Amount of Input GST of wholesaler:
Input CGST = ₹30
Input SGST = ₹30
Since the wholesaler sells the article to retailer at a discount of 20% on listed price, the selling price of article by wholesaler (or cost price for retailer) = Listed Price - Discount
$$\begin{aligned}= 1600 - \Big(\frac{20}{100}\times 1600\Big) \\[0.5em] = 1600 - 320\\[0.5em] = ₹1280\end{aligned}$$
The amount of GST collected by wholesaler (or paid by retailer):
CGST = 2.5% of 1280 = $\frac{2.5}{100}\times$ 1280 = 32
SGST = 2.5% of 1280 = $\frac{2.5}{100}\times$ 1280 = 32
∴ Amount of output GST of wholesaler(or input GST of retailer):
Output CGST = 32
Output SGST = 32
Since the retailer sells the article to consumer at a discount of 5% on listed price, the selling price of article by retailer (or cost price for consumer) = Listed Price - Discount
$$\begin{aligned}= 1600 - \Big(\frac{5}{100}\times1600\Big) \\[0.5em] = 1600 - 80 \\[0.5em] = ₹1520\end{aligned}$$
The amount of GST collected by retailer (or paid by consumer):
CGST = 2.5% of 1520 = $\frac{2.5}{100} \times$ 1520 = 38
SGST = 2.5% of 1520 = $\frac{2.5}{100} \times$ 1520 = 38
∴ Amount of output GST of retailer:
Output CGST = 38
Output SGST = 38
(i) the price per article inclusive of tax (under GST) which the wholesaler pays.
= Cost price of article for wholesaler + CGST paid by wholesaler + SGST paid by wholesaler
= 1200 + 30 + 30 = ₹1260
(ii) the price per article inclusive of tax (under GST) which the retailer pays.
= Cost price of article for retailer + CGST paid by retailer + SGST paid by retailer
= 1280 + 32 + 32 = ₹1344
(iii) the amount which the consumer pays for the article.
= Cost price of article for consumer + CGST paid by consumer + SGST paid by consumer
=1520 + 38 + 38 = ₹1596
(iv) the tax (under GST) paid by the wholesaler to the State Government for the article.
= Output SGST of wholesaler - Input SGST of wholesaler
= 32 - 30= ₹2
(v) the tax (under GST) paid by the retailer to the Central Government for the article.
= Output CGST of retailer - Input CGST of retailer
= 38 - 32= ₹6
(vi) the tax (under GST) received by the State Government.
= SGST paid by the manufacturer + SGST paid by the wholesaler + SGST paid by the retailer
= 30 + 2 + 6= ₹38