Foundation November 2016 Unit 2 Q13
13. Show clearly whether the following statement is true or false. [4]
‘If you increase a positive number by 10% and then decrease that new value by 10%, you get back to your original number.’
| Scheme | Marks | Comments |
|---|---|---|
| e.g. 1·1 × 100 or equivalent. | M1 | Candidates may use any value or amount. |
| = 110 | A1 | |
| 0·9 × 110 or equivalent. | M1 | F.T. 0·9 × ‘their answer’. |
| = 99 AND 'FALSE' | A1 | Accept any equivalent indication that statement is ‘FALSE’. |
Alternative method
| Scheme | Marks |
|---|---|
| Sight of either 1·1 OR 0·9 AND used in calculation | B1 |
| 1·1 × 0·9 | M1 |
| = 0·99 | A1 |
| Convincing statement. | A1 |