A number of graphs displaying cost behaviour patterns are shown below. The vertical axis on each graph represents total cost, and the horizontal axis represents the level of activity (volume).

1. Charges for data usage on a smartphone plana flat fixed charge for the first 500 MB, plus a variable cost per megabyte for usage above 500 MB.
2. Wages for software development staff, all of whom are paid a fixed monthly salary.
3. Licensing fees paid to the provincial government to operate dog sled tours. A fee of $10 per tour is paid for the first 1,000 tours, with no additional fees paid if tours exceed 1,000.
4. Cost of raw materials, where the cost starts at $7.50 per unit and then decreases by 5 cents per unit for each of the first 100 units purchased, after which it remains constant at $2.50 per unit.
5. Cost of a monthly high-speed Internet plan, where $50 is charged for 0250 MB usage, $75 for 251 to 500 MB usage, $100 for 501 to 750 MB usage, and $125 for 751 MB usage and above.
6. Wage expense paid to tree planters who receive $0.10 per tree planted.
7. Rent on a factory building donated by the county, where the agreement calls for rent of $100,000 less $1 for each direct labour-hour worked in excess of 200,000 hours, but a minimum rental payment of $20,000 must be paid.
8. Wages paid to sales staff who receive a fixed salary per month and sales commissions equal to 5% of sales for every sales dollar they generate above $250,000. No additional commissions are paid for sales above $1,000,000.
9. Raw materials costs, where the first 1,000 units cost $1 per unit, with the unit cost dropping to $0.80 per unit for quantities above 1,000.

Required:

1. For each of the above situations, identify the graph that illustrates the cost behaviour pattern involved. Any graph may be used more than once.

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