Numeracy Foundation June 2018 Unit 2 Q8
8. Miss Price has received her total bill for water.
It is based on estimates of how much fresh water is used and how much waste water is produced.
Her bill is £58.80.
Miss Price’s actual use of water was as follows:
- fresh water used 25·25 m3,
- waste water produced 22·31 m3.
Fresh water used costs £1.08 per m3.
Waste water produced costs £1.70 per m3.
By how much has Miss Price been overcharged or undercharged?
You must show all your working. [4]
| Scheme | Marks | Comments |
|---|---|---|
| (Fresh water charge £) 25.25 × 1.08 (= 27.27) | M1 | |
| (Waste water charge £) 22.31 × 1.70 (=37.927) | M1 | |
| (Total bill £27.27 + £37.927 = £) 65.19(7) or 65.2(0) | A1 | CAO |
| Undercharged (by) (£)6.4(0) or (£)6.39(7) | B1 | Must state under charged and the amount, however accept –(£)6.4(0) or –(£)6.39(7) FT difference between ‘their derived total’ and £58.80 with appropriate conclusion, over or under charged |