X = (20×25)/15 = 100/3 =
Example.2. The monthly income of a person is Rs 8000. If his income is increased by 20%, What will be his new monthly income?
New income = 120% of 8000 = (12/100)×8000 = 9600.
Example.3. If income of Ravi is 20% more than that of Ram, then income of Ram is how much percent less than that of Ravi?
Let Ram’s income be = 100
Then, Ravi’s income = 120⸫ Required percentage = (20/120)×(100) = 50/3 =
Example.4. If the price of a commodity be raised by 40%, by how much percent a householder reduces his consumption of that commodity, so as not to increase his expenditure?
Let initial price be 100
Price after increase = 140⸫ Required reduction = (40/140)×100 =
Example.5. A student has to score 30% marks to get through. If he gets 30 marks and fails by 30 marks, then find the maximum marks set for the examination.
Let the maximum marks be X
According to the question,
30X/100 = (30+30) → 30X/100 = 60 → X = 200
Example.6. In an examination, 20% of total number of students failed in History, 15% of total number of students failed in Hindi and 5% of total number of students failed in both. Find the percentage of students, who passed in both the subjects.
Let total number of students be 100
Then, students failed in History only = 20 – 5 = 15
And Students failed in Hindi only = 15 – 5 = 10
⸫ Total number of failed students = 15+10+5=30
⸫ Number of passed students in both the subject = 100-30= 70
⸫ Required percentage = 70%
Q.1.What the price of fans was reduced by 20%, the number of fans sold is increased by 40%. What was the effect on the sales in rupees?
(A) 12% decrease
(B) 12% increase
(C) 30% increase
(D) 40% decrease
Q.2. A screwdriver and a hammer cost the same now. If the price of a screwdriver in increased by 5% and that of the hammer by 3%, how much more will it cost to buy 3 screwdriver and 3 hammers?
Q.3. The population of a town is 12000. If the male population increases by 6% every and that of female by 8% then the total population at the end of the year become 12800. Find the number of males in the town.
Q.4. A student was asked to measure the length and breadth of a rectangle. By mistake, he measured the length 20% less and the breadth 10% more. If its original area is 200 sq cm, then find the area after this measurement
(A) 176 sq cm
(B) 206 sq cm
(C) 226 sq cm
(D) 316 sq cm
Q.5. Shohan spends 23% of an amount of money on an insurance policy, 33% on food, 19% on children’s education and 16% on recreation. He deposits the remaining amount of Rs 504 in bank. How much total amount of Rs 504 in bank. How much total amount does he spend on food and insurance policy together?
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