The average of 5 terms is 15. If the first 4 terms are 12, 17, 23 and 8, what will be the fifth term?
| Company Name | Demand (no. of items) | Production (no. of items) |
| Company A | 3500 | 1500 |
| Company B | 500 | 2000 |
| Company C | 2500 | 1000 |
| Company D | 1000 | 3500 |
How many extra number of items did company B produce over and above the number of items demanded from it?