Foundation June 2017 Paper 2 Q10
10 Suha is going to buy 150 envelopes.
Here is some information about the cost of envelopes in two shops.
| Letters2send Pack of 25 envelopes for £3.49 | Stationery World Pack of 10 envelopes for £2.10 Buy 2 packs get 1 pack free |
Suha wants to buy the envelopes as cheaply as possible.
Which shop should Suha buy the 150 envelopes from?
You must show how you get your answer. (4)
| Answer | Mark | Notes |
|---|---|---|
| Letters2send (supported) | P1 | for the start of a process to find comparable costs at either shop, e.g. \(150 \div 25\ (= 6)\) or \(150 \div 30\ (= 5)\), \(150 \div 10\ (= 15)\), \(2.10 \div 15 = (=0.14)\) |
| P1 | for process to find cost from Letters2send, e.g. \((150 \div 25) \times 3.49\ (= 20.94)\) | |
| P1 | for process to find cost at Stationery World, e.g. \((150 \div 30) \times 2 \times 2.10\ (= 21)\) | |
| C1 | for correct conclusion with correct values from each shop (20.94 and 21) | |
| OR | ||
| P1 | for the start of a process to find comparable costs, eg \(3.49 \div 25\ (= 0.1396)\), \(2.10 \div 10\ (= 0.21)\), \(25 \div 3.49 = (7.1\ldots)\), \(2.10 \div 15 = (= 0.14)\) | |
| P1 | for process to take into account the offer at Stationery World, eg buy 30 envelopes pay for 20, | |
| P1 | for complete process to find values that can be used for comparison, eg \(30 \times 0.13(96)\) and \(2 \times 2.10\ (= 4.2(0))\) | |
| C1 | for correct conclusion with correct values from each shop (4.1(88) and 4.2(0)) |