The values of a and b from the table are:

1. a = 30 and b = 270

2. a = 30 and b = 15

3. a = 45 and b = 15

4. a = 30 and b = 540

If the cost of 9 pens is ₹ 369, the cost of one dozen pens of the same make will be:

1. ₹ 42

2. ₹ 429

3. ₹ 942

4. ₹ 492

If y varies directly to x and y = 80 when x = 400; the value of y when x = 25 is:

1. 5

2. 25

3. 75

4. 125

A man working 48 hours per week earns ₹ 2,400. If he works for 36 hours per week, he will earn:

1. ₹ 3,200

2. ₹ 900

3. ₹ 1,800

4. ₹ 1,080