Уроки математики и физики (RU + UA)

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вторник, 17 июля 2018 г.

Lesson 12. Which is better value?

How do you spot the best value in shop?
To compare the cost, find the cost of 1 kitchen roll (the unit cost) for each pack.

 2 rolls for 1.20 gives 60 p per roll
3 rolls for 1.71 gives 57 p per roll

 The pack of 3 rolls is the best value (obviously you would only buy the pack of 3 kitchen rolls if you do not mind having that many rolls or have enough money to buy that pack at that particular moment).
750 g costs 225 p, so 1 g costs
500 g costs 160 p, so 1 g costs
So the 750 g box is the best value.

 OR

 500 g costs 160 p so
250 g costs 80 p
At this price,
3 × 250 g = 759 g cost
3 × 80 p = £2.40

 This is more expensive that the 750 g box.

 Test lesson 12
Other lessons:

Lesson 1. Wages
на

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