A coffee shop offers two yearly options for frequent customers. With Option I, customers pay only $1 per cup of coffee if they pay a one-time fee $50. With Optior 2, customers purchase a refillable mug and pay a fee for each refill, as shown in the graph.
Option 2
80
70
60
Total Cost ($)
30
20+
10-
10 15 20 25 30 35
Number of Refills
Part A
How much more is the one-time fee for Option I compared to the price of the refillable mug for Option 22 Enter the answer in the box