Foundation November 2020 Paper 1 Q9
9. Chris and Sue are buying some items for their vegetable garden.
(a)
| Vegetable Plants £1.99 for a single strip OR £7.50 for a box of 5 strips |
Chris buys a box of vegetable plants.
How much money does he save compared to buying 5 single strips? [3]
(b)
Sue buys 20 bags of compost costing £6.99 each and some packets of seed costing £2.89 each.
She correctly estimates her bill to be £170.
How many packets of seed did she buy? [3]
| Scheme | Marks | Comments |
|---|---|---|
| 5 × 1.99 – 7.50 or 5 × (1.99 – 7.50 ÷ 5) si | M2 | 9.95 – 7.50 or 5(1.99 – 1.50); may be in stages May be in £ or p but must be consistent M1 for 5 × 1.99 oe; implied by e.g. 9.95 or for (1.99 – 7.50 ÷ 5) oe; implied by e.g. 49p |
| (£) 2.45 or 245 (p) | A1 | Allow £2.45p but not 2.45p If no marks award SC1 for 5 × 2 – 7.50 or for use of 5 × 2 – \(k\) – 7.50, where \(0 \lt k \leqslant 0.1\) (but not 0.05); method must be seen for SC1 to be awarded |
| Scheme | Marks | Comments |
|---|---|---|
| (170 – 20 × 7) ÷ 3 or 20 × 7 + 10 × 3 (= 170) or 20 × 7 + 10 × 2.89 = 168.90 or 20 × 7 + 11 × 2.89 = 171.79 or 20 × 6.99 + 10 × 2.89 = 168.70 or 20 × 6.99 + 11 × 2.89 = 171.59 or 170 − 20 × 7 = 30 and 10 × 3 = 30 oe or 170 − 20 × 6.99 = 30.2 and 10 × 2.89 = 28.90 oe or 170 − 20 × 6.99 = 30.2 and 11 × 2.89 = 31.79 oe | M2 | M1 for 170 – 20 × 7 oe; implied by 30; may be embedded in e.g. (170 – 20 × 7) ÷ 2.89 or (170 – 20 × 6.99) ÷ 3 or for attempting to find multiples of 3 or 2.89 to make approximately 170 using e.g. 20 × 7 + ….. × 3 (= 170) or 20 × 6.99 + ….. × 3 (= 170) or 20 × 7 + ….. × 2.89 (= 170) or 20 × 6.99 + … × 2.89 (=170) or 170 − 20 × 7 and ….. × 3 or 170 − 20 × 6.99 and ….. × 2.89 |
| 10 or 11 | A1 | implies M2 if not from clearly wrong working but may not have working If no marks allow SC1 for (170 – 20 × 6.99) ÷ 2.89 seen; may be in stages |
| (6) |