1. 547 × 11 +644 × 25 + 72 × 50 + 89 × 101 = ?

2. Ajay made 1000 runs in 20 matches. If he made 0 runs in one match, find the average runs of other matches.

3. Average age of seven persons in a group in 30 years. The average age of five persons of this group is 31 years. What is the average age of the other two persons in the group?

4. The tax on the commodity is decreased by 30% and its consumption increased by 50%. Find the effect on revenue.

5. Two friends X and Y walks from A to B at a distance of 39 km at 3 km.hr and 3.5 km/hr. Y reaches the B and returns back and meet X at C. Find distance between A and C.

6. Ranjan's and Anurag's ages are in the ratio 4:5. Four years hence, their ages will become 5:6. What is Anurag's present ages ?

7. What is the difference between simple and compound interest for 2 years on Rs 24000 at 7% rate?