Instructions

For the following questions answer them individually

Question 71

If the radius of a cylinder is doubled and the height is reduced by 50%, then by how much percent does the volume increase/decrease?

Question 72

A company bought a machine for â‚¹40000 and spent â‚¹10000 on its repairs. After some time, the machine was sold for â‚¹45000. How much discount was offered?

Question 73

An item was sold for â‚¹500. If the selling price was 10% less, then the profit would have been 12.5%. What is the cost price of the item?

Question 74

How much time will it take a principal of â‚¹640 to yield â‚¹768 as an amount at 2.5% simple interest per annum?

Question 75

If $$(28 \div 4 \times 7) + (44 \div 4 \times 7) - (12 \times x) = 18$$, then the value of $$x$$ is:

Question 78

Name the Indian-origin scientist who got Canada's highest civilian award - The Order of Canada - for his three decades of pioneering research on workplace injury and the spine.

Question 80

What fraction of a rupee is one anna, which was a part of the old currency system of India?