GST and discounts

Percentage problems come in three kinds: find the part, find the percentage, or find the whole.

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Part: percentage × whole ÷ 100.
Percentage: part ÷ whole × 100.
Whole: part ÷ percentage × 100. Discounts: find the percentage, subtract. GST: add 10%.

GST of 10% is added to a $200 item. What is the price including GST, in dollars?

10% of 200 is 20. 200 + 20 = 220.

Answer: 220

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Divide by the whole, not by the part.

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