Wipro Company Numerical Ability Simple & Compound Interest

I just borrowed an interest-free $320 from my brother. I pay him back 2.5% of that amount in quarterly installments. If I already paid him $56, how many month have I been paying my loan back?
A. 4
B. 7
C. 14
D. 28
E. 21

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Wipro Other Question

N is odd. Which of these has to be even?
A. N+6
B. 3N+1
C. N+2
D. 2N-1
E. 3N
The ratio of students in the business classes to the students who aren’t taking business classes is 2:5. If there are 770 students in the university, how many aren’t taking any business classes?
A. 550
B. 220
C. 35
D. 480
E. 200