A cylindrical piece of metal of radius 2 cm and height 6 cm is shaped into a cone of same radius. The height of the cone is:

1) 8 cm

2) 12 cm

3) 14 cm

4) 18 cm

The ratio of  Viplav's age and Anil's age is 3 : 5 and the sum of their ages is 80 years. The ratio of their ages after 10 years will be: ' .

1)2 : 3

2) 1 : 2

3) 3 : 2

4)3: 5

A starts a business on Jan.1 with an investment of Rs.80,000. Four months later B joins with an investment of Rs.60,000. The percentage of profit B will get at the end of the year is nearly 
 1.42%
 2.37%
 3.33%
 4.31%