Campus Maths Puzzle Numerical Ability

Q. It is better to have 70% discount or 40 and 30% discount consequently?

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Campus Other Question

A refrigerator contains 12 cans.7 blue cans and 5 red cans. In how many ways can we remove 8 cans from the refrigerator so that at least 1 blue can and red can remains in the refrigerator. give an example for profit and loss in which profit and discount percent are same but not given and only selling price is given and find cost price