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Question 1. Ram adjusted his electronic weighing scale in a typical way. But he gives a discount of 10% in every transaction. His weighting scale shows 5 kg for 4 kg. What is the actual profit % when the displayed weight is 10 kg, if he sells the commodity at its cost price?
  1.    12.5%
  2.    10%
  3.    5%
  4.    25%
  5.    40%
Answer: Option A
: A

5kg ---> 4kg
10kg ---> 8kg
C.P of product of 1 kg = x
Total C.P = 8x
S. P = 10x - x(10% discount of 10x)
= 9x
Profit % = x8x×100
= 12.5%

Question 2. A trader makes a profit equal to the selling price of 50 articles when he sold 80 of the articles. What  %  profit did he make in the transaction?
  1.    183%
  2.    176%
  3.    183.33%
  4.    166.67%
  5.    6500
Answer: Option D
: D

Soln:Let S be the selling price of 1 article.Therefore, the selling price of 80 articles = 80 S The profit earned by selling these 80 articles = selling price of 50 articles = 50 S We know that Selling Price (S.P.) = Cost Price (C.P) + Profit ofSelling price of 80 articles = 80 S and Profit = 50 S 80 S = C.P + 50 S. Hence, C.P = 80 S - 50 S = 30 S.Profit %=(50S30S)×100=166.67%

Question 3. Alok borrows some money from the bank and the SI on the sum is  19th  the principal amount and the number of years is the rate of interest. Find r?
  1.    5.55%
  2.    2.33%
  3.    3.33%
  4.    None of these
  5.    Rs. 221970
Answer: Option C
: C

Answer = Option c Principal = P Time = x Rate = x SI=P9 SI=PRT100P9=Px2100 x2=1009x=103=3.33%

Question 4. Two cars are of the same cost price. One is sold at a profit of  15%  and the other for Rs. 23000 more than the first. If the net profit is  20% , find the cost price of each car.
  1.    Rs. 280000
  2.    Rs. 230000
  3.    Rs. 282000
  4.    Rs. 327500
  5.    Rs. 221970
Answer: Option B
: B

Let the cost price be ‘p’ then 2 (1.15 P) + 23000 = 2 (1.2 P) 0.1 P= 23000 P= Rs.230000 Hence option (b)