A natural gas provider charges customers based on the following fee schedule:
• Monthly service charge of $6.58
• 3.65 cents for the first 50 units
• 2.8 cents for the next 100 units
• 1.4 cents for any units over 100
a. What is the charge for using 38 units in a month?
b. What is the charge for using 75 units in a month?
c. What is the charge for using 225 units in a month?
d. Write the monthly charge as a function of the number of units used.
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