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1. A man sells a book at a profit of 20%. If he had bought it at 20% less and sold it for ₹ 18 less, he would have gained 25%. Find the cost price of the book.

₹ 90

₹ 85

₹ 80

₹ 75

2. A container, open from the top, made up of a metal sheet is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper ends as 8 cm and 20 cm respectively. Find the cost of milk which can completely fill the container at the rate of ₹ 15 per litre. [Use π = 3.14]

₹ 154.75

₹ 156.75

₹ 165.57

₹ 157.75

3. A right pyramid stands on a rectangular base of 24 cm x 18 cm, and each of the slant edges is 17 cm. Find its volume.

1154 cm^{3}

1152 cm^{3}

1512 cm^{3}

1215 cm^{3}

4. The difference between simple and compound interest on a certain sum of money for 3 years at 10% p.a. is ₹ 15.50. Find the sum.

₹ 600

₹ 500

₹ 400

₹ 800

5. If a man goes upstream at 6 km/hr and the rate of stream is 2 km/hr, then the man's speed in still water is

4 km/hr

8 km/hr

2 km/hr

13 km/hr