Percentage Problems with Solutions

1.If 15% of (A + B) = 25% of (A - B), then what per cent of B is equal to A?
 A. 10%
 B. 60%
 C. 200%
 D. 400%
 
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2.The difference of two numbers is 20% of the larger number. If the smaller number is 20, the larger number is:
 A. 25
 B. 45
 C. 50
 D. 80
 
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3.A person gave 20% of his income to his elder son, 30% of the remaining to the younger son and 10% of the balance, he donated to a trust. He is left with Rs.10080. His income was:
 A. Rs. 50000
 B. Rs. 40000
 C. Rs. 30000
 D. Rs. 20000
 
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4.If A exceeds B by 40%, B is less than C by 20%, then A : C is:
 A. 28 : 25
 B. 26 : 25
 C. 3 : 2
 D. 3 : 1
 
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5.How much pure alcohol has to be added to 400 ml of a solution containing 15% of alcohol to change the concentration of alcohol in the mixture to 32%?
 A. 60 ml
 B. 68 ml
 C. 100 ml
 D. 128 ml
 
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6.In the new budget, the price of kerosene oil rise by 25%. By how much per cent must a person reduce his consumption of kerosene oil so that his expenditure on it does not increase?
 A. 20%
 B. 25%
 C. 40%
 D. 50%
 
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7.In an examination, there were 1000 boys and 800 girls. 60% of the boys and 50% of the girls passed. Find the percent of the candidates failed?
 A. 44.4%
 B. 46.4%
 C. 48.4%
 D. 49.6%
 
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8.The price of an article is reduced by 25% but the daily sale of the article is increased by 30%. The net effect on the daily sale receipts is:
 A. 2½% increase
 B. 2½% decrease
 C. 2% increase
 D. 2% decrease
 
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