Numeracy Foundation November 2019 Unit 1 Q10
10. Ms Logan is calculating her next water bill.
She knows that her fresh water usage is 20 m3.
On the water company’s website she finds the following:
Water charges
- The waste water output is calculated as 80% of the fresh water usage.
- Fresh water usage costs £1.10 per m3.
- Waste water output costs £1.50 per m3.
Calculate Ms Logan’s water bill. [4]
| Scheme | Marks | Comments |
|---|---|---|
| (Fresh water charge £) 20 × 1.1(0) | M1 | (= £22) |
| (Waste water charge £) 0.80 × 20 × 1.50 | M2 | (= £24) M1 for either 0.80 × 20 (= 16m3) or 20 × 1.50 (= 30) |
| (Total bill £22 + £24 =) (£) 46 | A1 | CAO Award M2 (waste water) and SC1 for an answer of £28.4(0) (from fresh water (4 × 1.10 =) £4.40 + £24 for waste) OR Award M1 and SC1 for any one of the following:
|