you might want to do a proportion for this problem
[tex] \frac{28}{x} = \frac{8}{1} [/tex]
28$ is for 8 hours and 'x', which is the unknown number, is for 1 hour. we now have to cross multiply the numbers
[tex]28 \times 1[/tex]
[tex]8 \times x[/tex]
this will get you
[tex]28 = 8x[/tex]
now we have to divide 8 on both sides to find x.
[tex] \frac{28}{8} = \frac{8x}{8} [/tex]
your answer will be
[tex]3.5 = x[/tex]
so it cost 3.5 $ per hour
