Question

The child is not there.....

Ques-How to take out Mark Price and discount if only CP is given or only SP is given.

Answer 1

Discounts are offered on the marked price and the selling price is determined by the discount offered on the marked price. For the process of simplification, let us assume:
C = Cost price
S = Selling price
M = Market price
D% = Discount
G% = Gain

Now,
Discount = D% of marked price, M
Discount = Marked Price – Selling Price
Marked Price – Amount of Discount = Selling Price
M (1-D%) = Selling Price

Also, Selling Price = Cost Price + Gain
Thus,
M (1-D%) = C (1 + G%)
Or in other words
Marked Price (1 – Discount%) = Cost Price (1 + Gain%)

Example-1: Natasha offers her customers a discount of 10% on her beauty products and she still makes a profit of 20%. What is the actual cost to her of that beauty product marked Rs. 400?
Solution:
Marked price = Rs. 400
Discount = 10%
Profit = 20%
Therefore, the Selling Price = 90% of 400
Therefore 400 x 90/100 = Rs. 360
Selling price = Rs. 360
Profit = 20%
Cost price = 100/120 x 360 = Rs. 300

I think it will help you a lot to understand these concepts.