Book Maths Puzzle Numerical Ability

mini buys sweets at 4 for 90 p and an equal number at 5 for 90 p and sells the whole at 9 for 180 p. find her gain or loss percent.

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Book Other Question

a woman bought two parcels of toffees, the same number in each parcel. the first she bought at 25 p each but the second at 3 for 65p. she mixed then all together and sold them at rs. 3.50. a dozen. find her gain percent.

opt.
1. 10%
2. 15%
3. 20%
4. 25% by selling 45 oranges for rs. 80. a man loses 20%. how many should he sell for rs. 48, so as to gain 20% in the transaction?