Study the following bar chart and answer the questions carefully.

Which of the companies shows the maximum percentage difference in sales turnover between the two years ?

The value of $${3.157×4126×3.198\over63.972×2835.121}$$ is closest to : 

5-[4-{3-(3-3-6)}] is equal to:

Assume that
$$\sqrt{3} = 3.605 \ (approximately)  $$
$$\sqrt{130} = 11.40 \ (approximately)  $$
Find the value of
$$\sqrt{1.3} + \sqrt{1300}+\sqrt{0.013}  $$

Two numbers are in the ratio 3 : 4. Their L.C.M. is 84. The greater number is 

A shopkeeper marks the price of an item keeping 20% profit. If he offers a discount of $$12{1\over 2}\%$$ on the marked price, his gain percent will be 

The sum of three numbers is 252. If the first number is thrice the second and third number is two-third of the first, then the second number is

If x - y = 6 and xy = 40, then  find $$ {x^2+y^2}$$