Answer:
$20
Step-by-step explanation:
It is clear that deduction will be either [tex]2\\[/tex] percent or $20 , whichever is greater
Lets evaluate 2 percent of the last bill of [tex]870\\[/tex]
[tex]\frac{2}{100} * 870 \\= 17.4\\[/tex]
Thus, $17.4 is less than $ 20
Thus, $20 will be the minimum monthly payment