The charge is $2/m.
We need to find how much money it costs for 75cm.
First let's change 75cm to m. There are 100cm to m.
[tex] \frac{75cm}{1} * \frac{1m}{100cm} = 0.75m[/tex].
Now we can create a proportion to find how much it costs for a 0.75m ribbon. Then we solve it by cross multiplying.
For some reason I can't put the dollar sign ($) in front of the 2.
[tex] \frac{2}{m} = \frac{x}{0.75m} \\\\
x = 2(0.75) = 1.5[/tex]
It costs $1.50 to buy a ribbon 0.75m, or 75 cm long.
