81. The population of a town is 8500. It increases by 20% in the first year and by another 25% in the second year. What would be the population of the town after 2 years ?
82. In a survey of a city, it was found that 90 percent of the people in the city own a refrigerator and 15 percent own a washing machine. If everybody owns at least one appliance, what percentage owns both ?
83. A and B are two fixed points 5 cm apart and C is a point on AB such that AC is 3 cm. If the length of AC is increased by 6%, the length of CB is decreased by :
84. In an examination, 34% of the students failed in Mathematics and 42% failed in English. If 20% of the students failed in both the subjects, then the percentage of students who passed in both the subjects was :
85. If x% of a is the same as y% of b, then z% of b is :
86. In the price of sugar falls by $$2\frac{1}{2}\% $$ , a person can buy 9 kg more of sugar for Rs. 1260 than before. If the price had risen by $$12\frac{1}{2}\% $$ , how much sugar would he have bought for the same sum ?
87. At a special sale, 5 tickets can be purchased for the price of 3 tickets. If 5 tickets are purchased at the sale, the amount saved will be what percent of the original price of the 5 tickets ?
88. The price of sugar per kg increased from Rs. 16 to Rs. 20. The percentage reduction in the use of sugar so that the expenditure does not increase, should be :
89. If 50% of (x - y) = 30% of (x + y), then what percent of x is y ?
90. In a History examination, the average for the entire class was 80 marks. If 10% of the students scored 95 marks and 20% scored 90 marks, what was the average marks of the remaining students of the class ?
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