At noon, a barista notices she has $30 in her tip jar. If she makes an average of $0.75 from each customer, which of the following analytical models illustrates this situation?

The amount in the tip jar is $30.
The average earning from each customer is $0.75.
Let the number of customers is n.
The total tip=$(30+0.75n).
Thus, the given model is linear one as the power of n is 1.
Thus, option (A) is correct.