Christmas MT's answer to AKS's Primary 5 Maths Percentage question.
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Do note that each row of the model represents the cost of 1 pen, & the shaded area (amount of discount) will add up to allow you to buy 1 more pen for every 5 pens on discount.
Date Posted:
6 years ago
It should be when every 4 pens were given a 20% discount, you will have sufficient funds to buy another pen at a discounted rate (only requires 80%). Similar theory as having 5. Therefore 20 pens is the amount that you can buy from the discounted price. The original number of pens should be 20 - 4 = 16.
Original price should be $28 / 16 = $1.75.
Original price should be $28 / 16 = $1.75.
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