Question

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

Answer 1

Bank A

f-final cost
c-number of cheques

$f = 5 + 0.15c \\ \\ f = 5 + 0.15(13) \\ f = 5 + 1.95 \\ f = 6.95$
Bank B

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


a-red
b-blue