Bellingwolde BV operates car rental agencies at over 20 airports. Customers can choose from one of three contracts for car rentals of one day or less:

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Contract 1: 50 for the day. Contract 2: 30 for the day plus 0.20 per km travelled. Contract 3: 1.00 per km travelled. Required 1 Present separate plots for each of the three contracts, with costs on the vertical axis and kilo- metres travelled on the horizontal axis. 2 Describe each contract as a linear cost function of the form y = a + bx. 3 Describe each contract as a variable, fixed or mixed cost function.