Book Maths Puzzle Numerical Ability Alligation or Mixture

Rusabh sold some cds to rushant at the rate of 4 cds for the cost price of three.After a few days rushant sold the same cds back to rusabh at the rate of 3 cds for the price he had paid for four.Find the % loss incurred by rusabh?

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Book Other Question

How many parallelograms are formed when a set of 5 parallel lines intersects a set of 4
parallel lines?
Details and Assumptions
 All parallel lines are extended indefinitely.
Find the maximum value of n such that 30*60*81*100*90*700*343*720 is perfectly divisible by 30^n