Bank exam Maths Puzzle Numerical Ability Co-ordinate geometry

after allowing a discount of 10 percent , a shopkeeper gains 20 percent with respect to sp. to get 20 percent gain with respect to cp, the percentage of discount needed to be offered is?

options:
a: 13.6 % b:10% c:Can't say d: 15%

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Bank exam Other Question

average weight of 12 students in a class is 30kg. two boys leave the class and two boys whose avg weight is 25kg join the class. if the new average of the class is 30 5/6kg, what is the avg weight of the boys who left the class? 45% players played 1st world cup out of which 25 players played in only 1st world cup.57.5% players played 2nd world cup out of which 45 players played only 2nd world cup. 72.5% players played 3rd world cup out of which 110 players played only 3rd world cup. Find the players who played both 1st world cup and 2nd world cup but not 3rd world cup,if total number of players are 400?