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  Chapter 8 Comparing Quantities
  
  Solution:
  
  Question 3.
  If 20% of x is 25, then find x.
  Solution:
  20% of x = 25
  
  Hence x = 125
  
  Question 4.
  Express the following as a fraction
  (a) 35%
  (b) 64%
  Solution:
  
  Hence, profit = 25%
  
  Question 8.
  An article is marked at ₹ 940. If it is sold for ₹ 799, then find the discount per cent.
  Solution:
  MP = ₹ 940
  SP = ₹ 799
  Discount = MP – SP = 940 – 799 = ₹ 141
  
  Hence, discount = 15%
  
  Question 10.
  Find the amount if ₹ 2,000 is invested for 2 years at 4% p.a. compounded annually.
  Solution:
  
  Hence, the required amount = ₹ 4,230
  
  Hence, the net selling price = ₹ 2,63,952
  
  Question 17.
  Find the amount of ₹ 6,250 at 8% pa compounded annually for 2 years. Also, find the compound interest.
  Solution:
  
  Question 20.
  Find the compound interest on ₹ 48,000 for one year at 8% per annum when compounded half yearly. (NCERT Exemplar)
  Solution:
  Principal (P) = ₹ 48,000
  Rate (R) = 8% p.a.
  Time (n) = 1 year
  Interest is compounded half yearly
  
  Therefore Compound Interest = A – P = ₹ (519,16.80 – 48,000) = ₹ 3,916.80.
  
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