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A shop increases the price of a book from R80 to R100. Calculate the percentage increase. (5 marks)

1 answer

To calculate the percentage increase in the price of the book, you can follow these steps:

  1. Determine the increase in price: \[ \text{Increase} = \text{New Price} - \text{Old Price} = R100 - R80 = R20 \]

  2. Calculate the percentage increase: \[ \text{Percentage Increase} = \left( \frac{\text{Increase}}{\text{Old Price}} \right) \times 100 \] Substituting the values: \[ \text{Percentage Increase} = \left( \frac{R20}{R80} \right) \times 100 \]

  3. Perform the calculation: \[ \text{Percentage Increase} = \left(0.25\right) \times 100 = 25% \]

Therefore, the percentage increase in the price of the book is 25%.