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The strike rate of a batsman improved from 80 to 100. Rohit says that is a 20% increase. Is he right?

Class 8Comparing QuantitiesComparing Quantities
  • AYes, because 20 out of 100 is exactly 20%
  • BNo — a rise of 20 on a base of 80 is a 25% increase
  • CNo — the increase is 80 out of 100, that is 80%
  • DYes, because the strike rate went up by 20 whole points

Step-by-Step Solution

Percentage increase is always measured against the ORIGINAL value: %. Rohit divided by the new value 100 instead of the old value 80. A rise of 20 points is not the same thing as a rise of 20 percent.
Answer: B) No — a rise of 20 on a base of 80 is a 25% increase

Key idea: Sales tax / GST

Tax is added ON TOP of the selling price.

**Final price paid = SP + (SP × rate / 100) = SP × (1 + rate/100).**

Example: SP = ₹600, GST = 12%. Tax = . Final price = 600 + 72 = 672.

If both discount and tax apply, do **discount first** (off MP), then **tax on the discounted SP**.

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