Direction: What approximate value will come in place of the question mark (?) in the following question? (You are not expected to calculate the exact value)

6400.002 × 49.99 %   ÷ 999.99 =?

An umbrella is marked for ₹150 and sold for ₹138. The rate of discount is:

A number which when divided by 10 leaves a remainder of 9 , when divided by 9 leaves a remainder of 8 , and when divided by 8 leaves a remainder of 7 , is :

A sum of Rs. 8000 will amount to Rs. 8820 in 2 years if the interest is calculated every year. The rate of compound interest is 

Find the square root of (272² - 128²).

Directions : The pie graph indicates the break-up of the cost of construction of a house. Assuming that the total cost of construction is Rs 6,00,000, answer the following questions. 

The amount spent on timber is : 

From a point in the interior of an equilateral triangle, the length of the perpendiculars to the three sides are 6 cm, 8 cm and 10 cm respectively. The area of the triangle is

What is the difference (in ₹) between the simple interest and the compound interest on a sum of ₹8000 for $$32{2\over 5}$$ years at the rate of 10% p.a., when the interest is compounded yearly?