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1. A shopkeeper expects a gain of 22-1/2% on his cost price. If in a week, his sale was of Rs.392, what was his profit?

Rs.18.20

Rs.70

Rs.72

Rs.88.25

None of these

2. The sum of n terms of the series 1 + (1 + 3) + (1 + 3 + 5) + …. is:

n-n+1^{2}/2

n^{2}

n-n+1(2n+1)/6

Data inadequate

3. 081 × .484 /.0064 × 6.25 is equal to

0.9

0.99

9

99

4. A boy goes to his school from his house at a speed of 3 km./hr and return at a speed of 2 km./hr. If he takes 5 hours in going and coming, the distance between his house and school is

5 km

5.5 km

6 km

6.5 km

5. A can do a certain work in the same time in which B and C together can do it. If A and B together could do it in 10 days and C alone in 50 days, then B alone could do it in:

15 days

20 days

25 days

30 days