Wipro Company Numerical Ability Arithmetic

If the class marks in frequency distribution weights of students be 128,137,146,155,164,173&182kgs then the first class boundary is
A)121.5 B)122.5 C)123.5 D)124.5

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Wipro Other Question
The rectangle box with square base is open at the top.The maximum volume of the box made from 1200 m2 tin,in m3 is:
A)2000 B)2500 C)3000 D)4000 The difference between the compound and simple interest on a certain sum for 2 years at the rate of 8% per annum is Rs.80,What is the sum?
A)11,880 B)12,500 C)13,250 D)14,270