The radius of a sphere is increased by 10%. The surface area increases by
21%
31%
41%
51%
152.
The population of a town is decreased by 20% and 25% in two successive years. What per cent population is decreased after two years?
50%
40%
30%
60%
153.
. A number is increased by 20% and then decreased by 20%, final value of the number
Does not change
Decrease by 2%
increase by 4%
Decrease by 4%
154.
If 12% of x is equal to 6% of y, then 18% of x will be equal to b much per cent of y?
7%
9%
11%
none of these
155.
If 200% of a number is 90, then what is the 80% of that number
48
38
24
36
156.
Express 7/ 8 as percentage.
67 1/2 %
87 1/2%
97 1/2%
none of these
157.
What per cent of 12 is 84?
8000%
6000%
7000%
none of these
158.
6 2/3% expressed as a fraction in its lowest term is
2/15
1/15
3/15
4/20
159.
What percentage is equivalent to 5?
525%
625%
725%
none of these
160.
20 liters of a mixture contains milk and water in the ratio 5: 3. If 4 liters of this mixture are replaced by 4 liters of milk, the ratio of milk to water in the new mixture will become: