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bank a charges a monthly service fee of $5.00 and per check fee of $0.15 while bank b charges a monthly service fee of $2.50 and a per check fee of $0.35 which of these numbers of monthly checks will cause bank a to change less in fees than bank b

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alexandraZ
Bank A

f-final cost
c-number of cheques

[tex]f = 5 + 0.15c \\ \\ f = 5 + 0.15(13) \\ f = 5 + 1.95 \\ f = 6.95[/tex]
Bank B

[tex]f = 2.5 + 0.35c \\ f = 2.5 + 0.35(13) \\ f = 2.5 + 4.55 \\ f = 7.05[/tex]
At the thirteenth cheque, bank a is cheaper than bank b


a-red
b-blue

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