Aptitude - Aptitude-Percentage

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The price of petrol is increased by 25%. By what percent the consumption be reduced to make the expenditure remain the same?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    It is equivalent to 1.25 decreased to 1. % decrease = (1.25-1)/1.25 X 100 = 20%

A saves 20% of his income. His income is increased by 20% and so he increased his expenditure by 30%. What is the percentage change in his savings?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    Let I be the income. Expenditure = 0.8I Savings = 0.2I => 20% New income = 1.2I (since 20% rise) New expenditure = (0.8I) X 1.3 (Since 30% rise) = 1.04I So, new savings = 1.2I – 1.04I = 0.16I => 16% (So income decreased form 20% to 16%) % decrease = (20-16)/20 X 100 = 20%.

In a theatre, the number of seats is increased by 20% and the price per ticket is increased by 10% but the public response decreased by 30%. What is the net effect on the economy of the theatre?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    Net effect = 1.2 X 1.1 X 0.7 = 0.924 => 7.6% decrease

The population of a city is increased by 30% and thus became 78000. What is the original population?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    1.3 x = 78000 => x = 60000

A value changes from 30 to 80. What is the percentage change?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    % increase = (80-30)/30 X 100 = 166.66 %

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