Mr Jackson has a large room which can be hired for children’s parties. He has a time limit of 4 hours and the room can accommodate a maximum of 25 children. His charges are detailed in the following table:
| number of children | ||||
| 6-10 | 11-15 | 16-20 | 21-25 | |
| 2 hours | $100 | $150 | $200 | $250 |
| 2 hours and 30 minutes | $121 | $171 | $221 | $271 |
| 3 hours | $142 | $192 | $242 | $292 |
| 3 hours and 30 minutes | $163 | $213 | $263 | $313 |
| 4 hours | $184 | $234 | $284 | $334 |