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The tank full of petrol in Haroon's motorcycle lasts for 10 days, if he starts using 25% more every day for how many days will the tank full of petrol last?

Correct answer: D. 8days

  • A. 5days
  • B. 6days
  • C. 7days
  • D. 8days

Explanation

If the normal daily consumption is 1 tank-day, using 25% more means consuming 1.25 tank-days per day. The duration is 10 tank-days ÷ 1.25 tank-days per day = 8 days. A student may choose 7 days by subtracting 25% of 10 from 10, which incorrectly treats the increase as a direct reduction in duration.

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Percentages express a quantity as parts per hundred and support calculations involving increases, decreases, discounts, commissions, taxes, and successive changes. Questions require distinguishing percentage change from percentage points and identifying the original value when a final value and its percentage change are given.

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