Question

A cable installer charges 42.50 per hour plus a 60.00 service charge , find the total charges of it takes the cable installer 3.5 hours to complete

Answer 1

$\bf \begin{array}{ccllll} hour&cost\\ \textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\ 1&42.50\\ 3.5&x \end{array}\implies \cfrac{1}{3.5}=\cfrac{42.50}{x}$

so... that'll give you the hourly charges
now, he also charges a $60 fixed amount
so, whatever you get in hourly charges, add 60 to that, and that's
the total bill