The marked price of an article is ₹3500 and rate of GST is 12 percent. A shopkeeper allows a discount of 20 percent and still makes a profit of 10 percent. Find the original cost price of the article and the selling price including GST.
Answer Marked price = rs. 3500 GST % =12 % so, SP = 3500 + 12% of 3500 or, SP = 3500 + 0.12 ×3500 = rs. 3920 After discount the new SP = 3920 - 20% of 3920 = 3920 - 0.20×3920 = rs. 3136 (1) profit% = 10 % ; SP = rs. 3136 Let CP = X so, SP = CP + 10% of CP or, 3136 = X + 0.10 X or, 3136 = 1.10 X or, X = 3136/1.10 original CP = 2850.909. { you can also use a formula, Cp=(SP*100) / 100+profit%}