Foundation November 2017 Paper 1 Q16
16 Berenika wants to buy 35 T-shirts.
Each T-shirt costs £5.80
Berenika does the calculation \(40 \times 6 = 240\) to estimate the cost of 35 T-shirts.
(a) Explain how Berenika’s calculation shows the actual cost will be less than £240 (1)
There is a special offer.
| T-shirts £5.80 each. Buy 30 or more T-shirts. Get 10% off the total cost. |
(b) Work out the actual cost of buying 35 T-shirts using the special offer. (4)
| Answer | Mark | Notes |
|---|---|---|
| Explanation | C1 | eg States over-estimated for both values |
| Answer | Mark | Notes |
|---|---|---|
| 182.7(0) | P1 | for a process to find 10% of a value stated in the question eg \(\dfrac{10}{100} \times 5.80\ (= 0.58)\) or \(\dfrac{10}{100} \times 35\ (= 3.5)\) oe or \(35 \times 5.80\ (= 203)\), allow \(30 \times 5.80\ (= 174)\) or \(35 \times\) [reduced price] |
| P1 | for a process to find 90% of a value stated in the question eg \(35 - \text{``}3.5\text{''}\ (= 31.5)\) or \(0.9 \times 5.80\ (= 5.22)\) oe or \(\dfrac{10}{100} \times \text{``}203\text{''}\ (= 20.3)\) or \(\dfrac{10}{100} \times \text{``}174\text{''}\ (= 17.4)\) oe | |
| P1 | for a complete process to find actual cost of 35 eg \(0.9 \times 5.80 \times 35\) oe | |
| A1 | cao SC B2 156.6(0) |