Question

Type the correct answer in each box. Use numerals instead of words.

Answer 1

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]