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      Question

      Sana uses x% of her earnings on house rent, then spends

      20% of the remaining on groceries, pays Rs. 9400 as miscellaneous bills, and saves Rs. 7240 from a total of Rs. 32000. Find x.
      A 24 Correct Answer Incorrect Answer
      B 12 Correct Answer Incorrect Answer
      C 42 Correct Answer Incorrect Answer
      D 35 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, 32000 Γ— {(100 βˆ’ x)/100} Γ— (80/100) βˆ’ 9400 = 7240 = 32000 Γ— 80/10000 Γ— (100 βˆ’ x) βˆ’ 9400 = 7240 = 256 Γ— (100 βˆ’ x) βˆ’ 9400 = 7240 25600 βˆ’ 256x βˆ’ 9400 = 7240 16200 βˆ’ 256x = 7240 256x = 16200 βˆ’ 7240 = 8960 x = 8960/256 = 35

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