If a merchant makes a profit of 20% after giving a 20% discount, what should be his mark-up?

If a merchant makes a profit of $$20\%$$ after giving a $$20\%$$ discount, what should be his mark-up?

A
$$40$$
B

$$50$$
C
$$60$$
D
$$70$$

Assume cost price $$=100$$.
As profit $$\%=20\%$$, profit made after the discount $$=20\%$$ of $$100=Rs.20$$
So, selling price $$=Rs.120$$.
The merchant makes this profit of $$20\%$$ after a discount of $$20\%$$.
Therefore, he is selling at Marked price - $$20\%$$ of marked price $$=80\%$$ of marked price.
i.e., $$80\%$$ of marked price $$=Rs.120$$
$$\dfrac{80}{100}$$ of marked price $$=120$$
Marked price $$=120\times\dfrac{100}{80}$$
Markup $$=50\%$$

IBPS RRB Clerk Provisional Allotment List (CRP-RRBs-X) released on 22nd September 2022. Earlier, the IBPS RRB Clerk Prelims Scorecard (CRP RRBs XI) was released on 13th September 2022. The Mains Examination will be held on 24th September 2022. The IBPS RRB Clerk Admit Card for the Mains Exam (CRP-RRB-XI). has also been released and candidates can download the same by 24th September 2022. The final selection of the candidates will be based on their scores in the Mains Exam. A total number of 4483 vacancies are released for the RRB Office Assistant 2022. With a decent pay scale of Rs. 11,765 to Rs. 31,540, it is a golden opportunity for job seekers. Prepare well for your excam with the help of IBPS RRB Clerk books.