Self Exam Numerical Ability Profit and Loss

A publisher sells cipies of a book retail dealer at 5 Rs.per copy.but allow 25 copies to be countes as 24.if the retailer sells each of the 25 copies at Rs.6.his profit percentage

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Self Other Question

Solve :
42 : 56 :: 110 : ?
at a party,a grandfather,a grandmother,two fathers,two mothers,four children,three grandchildren,one brother,two sisters,two sons,two daughters,one father-in -law,one mother-in-law and one daughter-in-law sit at a table.at least how many people are sitting at the table?

a)7 (b)15 (c)22 (d)23