Directions: The table given here shows the production of five types of cars by a company in the year 1989 to 1994. Study the table and answer questions.

In which year the production of cars of all types taken together was approximately equal to the average of the total production during the period?

Shivani purchased five pens for ₹600. She sells these five pens at the rate of ₹50 per pen. What is the approximate lo percentage that Shivani incurred on selling the five pens?

A vertical pole and a vertical tower are on the same level of ground in such a way that from the top of the pole, the angle of elevation of the top of the tower is 60⁰ and the angle of depression of the bottom of the tower is 30⁰. If the height of the tower is 76 m. then find the height (in ₹) of the pole.

The difference between the simple interest and the compound interest on a certain amount at 5% for two years is 25, what is the amount?

A can do a piece of work in 18 days and B in 36 days. If they work together for 9 days, then what percentage of work will be left?

Find the sum of 2x terms of the series ( 1² - 2² + 3² - 4² + ___ ) 

If a=25, b=15 , c=-10 then find the value of $$ {a^{3}+b^{3}+c^{3}-3abc\over {(a-b)^{2}+(b-c)^{2} +(c-a)^{2}}}$$

A man travel from A to B at 20 km/Hr. and come back from B to A at 30 km/hr. Find the average speed of the whole journey.