If plot is for rs. 18700 the owner loses 15 %. find the price at which it must be sold to gain 25% ?

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

Google it that might work

He will need 2,898 pieces of paper