Answer:
[tex] \boxed{ \: company : B : \: } \\ \underline{ \boxed{ has \: a \: proportional \: relationship}} [/tex]
Step-by-step explanation:
[tex]let \: company : A : weight \: and \: cost\: be \to \: w_A \: and \:c_A \\ let \: company : B : weight \: and \: cost\: be \to \: w_B \: and \:c_B \\ \underline{\boxed{ \: company : A : \:} } \\ if \to \: c_A \infty w_A \\ c_A = k w_A \\but \to : \\ k = \frac{c_A}{w_A} = \frac{10.55}{1} \not= \: \frac{10.85}{2} \not= \frac{11.15}{3} \\ therefore \to : \\ \boxed{ \: company : A : \: } \\ \underline{ \boxed{ has \: no \: proportional \: relationship}} \\ \\ \underline{\boxed{ \: company : B : \:} } \\ if \to \: c_B \infty w_B \\ c_B = k w_B \\but \to : \\ k = \frac{c_B}{w_B} = \frac{2.75}{1} = \frac{5.5}{2} = \frac{8.25}{3} = 2.75 \\ hence \to : \\ \boxed{ \: company : B : \: } \\ \underline{ \boxed{ has \: a \: proportional \: relationship}} [/tex]
