Whilst marking hundreds of OCR papers over the summer, I noticed a lot of students understood PED but mistakenly put price on the top of the calculation and quantity on the bottom. Here is a very simple way to make sure pupils always put % change in quantity on the top and % change in price on the bottom for PED.
Formula for PED
Always make sure quantity is on top and price is on the bottom
Queen is always above the Pauper (or poor guy)
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