71. The monthly salaries of A and B are the same. A, B and C donate 10%, 8% and 9% respectively, of their monthly salaries to a charitable trust. The difference between the donations of A and B is Rs. 400. The total donation by A and B is Rs. 900 more than that of C. What is the monthly salary of C?
72. Price of rice is decreased by 25 percent and therefore a person can purchase 30 kg more rice in the same expenditure. If expenditure is Rs. 5400, then what was the original price of rice per kg?
73. If a positive number 'k' when multiplied by 30% of itself gives a number which is 170% more than the number 'k' then the number 'k' is equal to:
74. If 40% of a number is less than its 60% by 30, then the 20% of that number is:
75. If A is 40% less than B and C is 40% of the sum of A and B, then by what percentage is B greater than C?
76. If A's salary is 30% more than B's salary, then by what percentage is B's salary less than that of A? (correct to one decimal place)
77. Rishu saves x% of her income. If her income increases by 26% and the expenditure increases by 20%. then her savings increase by 50%. What is the value of x?
78. If the price of petrol is increased by 28%, by what percentage should the consumption be decreased by the consumer, if the expenditure on petrol remains unchanged? (Correct to 2 decimal places)
79. Salary of Mohit is 60% more than Vijay. Salary of Vijay is how much percent less than Mohit?
80. In an election contested between two candidates, 15% of the total voters did not cast their votes and 100 votes got disqualified. The candidate who won the election won it by securing 45% of the total votes and won by a margin of 400 votes. Find the total number of voters?
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