Problem 1 :
A student multiplied a number by 3/5 instead of 5/3. What is the percentage error in the calculation ?
Problem 2 :
There are 15 boys and 12 girls in a section A of class 7. If 3 boys are transferred to section B of class 7,then find the percentage of boys in section A.
Problem 3 :
If there are 3 boys and 7 girls in a class then, what percent of the class is made up of boys ?
Problem 4 :
Two numbers are respectively 20% and 50% are more than a third number, Find the the ratio of the two numbers.
Problem 5 :
In a triangle, the first angle is 20% more than the third angle. Second angle is 20% less than the third angle. Then find the three angles of the triangle.
Problem 6 :
A trader cheats his customer to make a profit by stating that he sells at cost price but gives his customers only 800 grams. for every 1000 grams. What is his profit percentage?
Problem 7 :
A sells to B an item at 15% profit. B sells the same item to C at 20% profit. If C pays $1656 for it, find the price at which A bought the item.
Problem 8 :
Mr. Lenin sold a chair at a loss of 15%. If he had sold at a profit of 10%, he would have got $100 more. What is the cost is the cost price of the chair?
Problem 9 :
If good are purchased for $ 1500 and one fifth of them sold at a loss of 15%. Then at what profit percentage should the rest be sold to obtain a profit of 15%?
Problem 10 :
By selling 20 articles, a trader gained the selling price of 5 articles. Find the profit percent.
(1) 64%
(2) 50%
(3) 30%
(4) 4 : 5
(5) 72°, 60° and 48°
(6) 25%
(7) $1200
(8) $400
(9) 22.5%
(10) 33.33%
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