The selling price of shoes is 420 rupees.
The GST on the selling price is 5 percent.
Let the original price be x.
The original price of shoes is determined by
[tex]x+\frac{5x}{100}=420[/tex][tex]\frac{105x}{100}=420[/tex][tex]x=\frac{420}{105}\times100=400[/tex]The original price of the shoes is 400 rupees. The correct optin is ii.