21) Michelle has just been informed that her cell phone plan will be increasing in price. Her new pricing plan has a flat fee of $25.00 per month, plus a cost of $0.09 per minute of usage. Based on her budget,
Michelle has determined she can only afford to use a maximum of 209 minutes per month. Based on
this information, what is the highest amount Michelle will pay for her cell phone per month?
a) $18.81
b) $5.23
c) $43.81
d) $25.09