Others Maths Puzzle Numerical Ability Profit and Loss

a shopkeeper gives 4% discount on marked price and gives 1 article free for every 15 article and gaining 35%.The marked price is above on cp by???

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Others Other Question

Buffalo gives 5 ltr, Cow gives 2 ltr and goat gives 250 ml milk. Total milk should be 50 ltr. So how many buffalo , cow and goats are there while they should be 19 in total. The sum of the first 6 terms of an A.P is zero and the 4th term is 2 then find the sum of its first 30 terms.