Foundation June 2025 Paper 3 Q7
7 A mobile phone company has two different plans.
| Plan A Phone £500 plus £11 per month for 24 months | Plan B Phone is free plus £35 per month for 24 months |
(a) Show that the total cost of Plan A for 24 months is £764 [2 marks]
(b) During a sale, the total cost of Plan B is reduced by 10%
Which plan is cheaper for 24 months during the sale?
Tick a box.
- Plan A
- Plan B
Show working to support your answer. [3 marks]
| Answer | Mark | Comments |
|---|---|---|
| \(11 \times 24\) or \(764 - 500\) or 264 | M1 | oe |
| \(11 \times 24 + 500 = 764\) or \((764 - 500) \div 11 = 24\) or \((764 - 500) \div 24 = 11\) or \(764 - 500 = 264\) and \(11 \times 24 = 264\) | A1 | oe eg \(11 \times 24 = 264\) and \(264 + 500 = 764\) |
Additional guidance
| Condone \(11 \times 24 = 264 + 500 = 764\) | M1A1 |
| Condone \(11 \times 24\) and \(264 + 500 = 764\) | M1A1 |
| \(264 + 500 = 764\) without \(11 \times 24\) | M1A0 |
| Answer | Mark | Comments |
|---|---|---|
| Alternative method 1: total price | ||
| \(35 \times 0.1 \times 24\) or 84 or \(35 \times 0.9 \times 24\) or 756 | M2 | oe eg \(35 \times 24 - 35 \times 0.1 \times 24\) M1 \(35 \times 24\) or 840 oe or \(35 \times 0.1\) or 3.5(0) oe or \(35 \times 0.9\) or 31.5(0) oe or \(24 \times 0.1\) or 2.4 oe or \(24 \times 0.9\) or 21.6 oe |
| 756 and Plan B | A1 | |
| Alternative method 2: monthly price | ||
| \(764 \div 24\) or 31.8(…) | M1 | oe |
| \(35 \times 0.9\) or 31.5(0) | M1 | oe |
| 31.8(…) and 31.5(0) and Plan B | A1 | |
Additional guidance
Ignore further working after correct answer