2 Answers

Adam Smaka · Answer 1 · 2019-03-02T21:02:40+0000

One twentieth is 5%, so the total cost is

f(c) = 1.05 c

The domain is [80, 180]

For Albert to afford the shoes

$f(c) \le 105 + 42$

$1.05 c \le 147$

$c \le 147/1.05 = 140$

That's the maximum so he can afford shoes with preshipping prices in the domain

[80, 140]

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