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Primary 6 · Percentage · Question type

P6 Percentage: Discount and GST Questions

Apply the discount to the original price, then calculate GST on the discounted price.

Try the question yourself, or watch the lesson first.

Primary 6, on the MOE Primary Mathematics syllabus.

In the Percentage chapter9 question types · see the chapter

The lesson · 3 minutes 12 seconds

How do you solve P6 percentage discount and GST questions?

Watch: a $500 television, 20% off, then 9% GST

Another worked example

A worked example

A shop took 25% off the marked price of a fridge and then added 9% GST to the discounted price. A customer paid $654. What was the marked price of the fridge?

The working · Nine lines

The step-by-step working

Written out in full, the way it should appear on paper.

  1. 100% + 9% = 109%
  2. 109% = $654
  3. 1% = $654 ÷ 109 = $6
  4. 100% = 100 × $6 = $600
  5. $600 is the price after the discount, so $600 is 75% of the marked price
  6. 100% - 25% = 75%
  7. 75% = $600
  8. 1% = $600 ÷ 75 = $8
  9. 100% = 100 × $8 = $800

The answer is $800.

Practise · Modelled on top school exam questions

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Try it yourself

Find the price after a discount

Try solving it yourself before checking your answer and working.

A school bag has an original price of $300. It is sold at a 25% discount. How much does the customer pay for the bag?

$

Show the step-by-step solution
  1. 100% - 25% = 75%
  2. 100% = $300
  3. 1% = $300 ÷ 100 = $3
  4. 75% = 75 × $3 = $225

Ans: $225

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Next, use a given percentage and part to find the whole. Finding the Whole from a Percentage →

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