If you sale by $800 your commission is $112.
make it fraction .
\(\frac{800}{112}\)
now if you sale by 1400$ how much is the commission
again make this as fraction too
\(\frac{1400}{x}\)
equal the two fractions and solve for x
\(\frac{800}{112} = \frac{1400}{x}\)
\(x = \frac{112*1400}{800}\)
\(x = 196\)
so the commission is 196$
is that helps ?
