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A trader purchases 100 smartphones at Rs. 12,000 each. He spends Rs. 30,000 on transportation and Rs. 20,000 on advertising. 10 phones are damaged in transit and sold at 50% loss. The remaining are sold at a 25% profit. What is his net profit or loss? 

Simplify:\(\sqrt8\times \sqrt{32}\)

The volume of a prism is 960 cm³. If its base area is 80 cm³, by what percentage should the height be increased to make the volume 1200 cm³?

A container holds 120 litres of a solution containing milk and water in the ratio 3 : 2. If 24 litres of this solution are taken out and replaced with pure milk, what will be the new ratio of milk to water?

The lines 2x - 3y = 6 and kx + y = 4 are perpendicular. What is the value of k?

If the equation of a line is 2x + 3y = 6, what is the slope of the line? 

if one angle is twice the other and they are complementary, find the angles

If an angle is 10° more than twice its complement, what is the angle?

If an angle is 3 times its complement, what is the angle? 

If the radius of a right circular cylinder is increased by 10 percent while its height remains constant, what is the percentage increase in its volume?