Percentage

Q31. If the price of sugar falls by 5%, by how much percent must a house holder increase its consumption, so as not to decrease its expenditure on sugar ?
(a) 3 3/19 %
(b) 5 5/19 %
(c) 7 7/19 %
(d) 9 9/19 %

Q32. If 10% of A = 20% of B = 1/5 of C, then A:B:C is
(a) 2:1:1
(b) 1:2:1
(c) 1:1:2
(d) 1:2:2

Q33. 4 liters of water is added to 20 liters of a mixture of a 40% solution of alcohol in water. The strength of alcohol is now ?
(a) 23 1/3 %
(b) 27 1/3 %
(c) 33 1/3 %
(d) 37 1/3 %

Q34. By how much is 30% of 80 greater than 56 of 24 ?
(a) 3
(b) 4
(c) 5
(d) 7

Q35. x % of y is y % of ?
(a) x
(b) xy
(c) xy2
(d) x2

Q36. When a number is first increased by 10% and then reduced by 10% the number
(a) 1%
(b) 2%
(c) 5%
(d) 10%

Q37. What is 30% of 30% equal to ?
(a) 0.06
(b) 0.09
(c) 0.12
(d) 0.15

Q38. If the side of a square is decreased by 10% then its area is decreased by ?
(a) 10%
(b) 12%
(c) 16%
(d) 19%

Q39. Which number is 40% less than 70 ?
(a) 49
(b) 46
(c) 45
(d) 42

Q40. The price of an article has been reduced by 20%. In order to restore
(a) 49
(b) 46
(c) 45
(d) 42