4400 Higher June 2005 Paper 4 Q2
2 Krishnan used 611 units of electricity.
The first 182 units cost £0.0821 per unit.
The remaining units cost £0.0704 per unit.
Tax is added at 5% of the total amount.
Complete Krishnan’s bill.
| 182 units at £0.0821 per unit | £ .......... |
| ...... units at £0.0704 per unit | £ .......... |
| Total amount | £ .......... |
| Tax at 5% of the total amount | £ .......... |
| Amount to pay | £ .......... |
(7)
| Scheme | Marks |
|---|---|
| 14.9422 | B1 |
| 611 − 182 = 429 | B1 |
| “429” × 0.0704 or 30.2016 | M1 |
| “14.9422” + “30.2016” or 45.1438 | M1 |
| “45.1438” × 5/100 or 2.25719 | M1 |
| “45.1438” + “2.25719” | M1 |
| 47.40(099) | A1 |
| (7) | |
| (7 marks) |
Notes
B1: Allow working to 3 s.f. or better throughout
M marks can be implied
M1: 45.14 × 1.05 or 47.50 or 2.25 Can be awarded in previous line
A1: At least 2 d.p.