1MA0 Foundation June 2013 Paper 1 Q11
*11 Here are the costs of pens in two shops.
| Shop A | Shop B |
|---|---|
| 3 pens for £2 | 5 pens for £3 |
Mrs Evans wants to buy 30 pens for the cheapest possible cost.
Which shop should she buy the pens from?
You must show all your working. (4)
| Answer | Mark | Notes |
|---|---|---|
| QWC Shop B with working | 4 | Considering cost of all pens M1 for a correct start eg. 30 ÷ 3 or 10 or 3×10 or 30 ÷ 5 or 5×6 or 6 or list of at least six multiples of 3 or 5 M1 for complete correct method to find total cost for shop A or complete correct method to find total cost for shop B eg. for A : 30÷3×2 or 10×2 or list of multiples of 3 to 30 with (£)20 or 3×10 with (£)20 eg. for B : 30÷5×3 or 6×3 or list of multiples of 5 to 30 with (£)18 or 5×6 with (£)18 A1 for (£)20 and (£)18 C1 (dep on M1) ft for statement giving “Shop B” with two comparable figures [SC : B1 for (£)18 and (£)20 without working] OR Considering cost of one pen (or could be for 15 pens) M1 for correct method to find cost of one pen in shop A or correct method to find cost of one pen in shop B M1 for correct method to find cost of one pen in shop A and correct method to find cost of one pen in shop B A1 for 66.6...p rounded or truncated to at least 2 sig figs eg. 66(p) or 67(p) and 60(p) C1 (dep on M1) ft for statement giving “shop B” with two comparable figures [SC : B1 for 66.6...p rounded or truncated to at least 2 sig figs eg. 66(p) or 67(p) and 60(p) without working] |