engineering recuitment OPSC Assistant Industries Officer Mock Test 2025 Quantitative Aptitude Profit and Loss Discount and MP
A shopkeeper earns a profit of 21% after selling a book at 21% discount on the printed price. The ratio of the cost price and selling price of the book is:
1
100 : 79
2
79 : 100
3
100 : 121
4
121 : 100