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The graph models the charge for a printing session. \(t\) is measured in minutes, and \(C\) is measured in $

The model's domain is \(0 \le t \le 5\). The graph uses unit gridlines in the stated axis units

Cartesian graph with horizontal axis Machine time (minutes) and vertical axis Total charge ($). The window is x from -1 to 6 and y from 61 to 84, with unit gridlines in the displayed axis units. The model segment covers the stated domain from (0, 65) to (5, 80). Marked points: P is (1, 68), Q is (3, 74), R is (4, 77).-10123456626466687072747678808284PQRmodelMachine time (minutes)Total charge ($)
1 mark

What is the constant rate of change?