The centroid of triangle ABC is G = (6, -3). If A = (-6, -3), B = (x, 6) and C = (9, y), then the values of x and y are :

1. x = 6, y = 15

2. x = 15, y = -12

3. x = 15, y = 6

4. x = -15, y = 6

The mean of 6 different data is 12. If 5 of these data are 16, 18, 12, 13 and 8; the sixth data is :

1. 63

2. 6 × 12

3. 5

4. 12 × 3

In the adjoining figure, O is the center of the circle. If angle BOC = 140°, the value of x is :

1. 70°

2. 30°

3. 40°

4. 20°

A man deposits ₹ 1800 per month in a recurring deposit account for 2 years. If he gets ₹ 3600 as interest at the time of maturity, find the rate of interest.