Question 915871
John's pay is $ 11 650 one month. Looks like his base pay is $ 4000 and the rest is commission.
Now, his commission is 9 % and that is equal to
$ 11650 - $ 4000 = $  7650 . 

So, to find his sales for the month,

9/100x = 7650
0.09x  = 7650
x      = 85 000 

His sales for the month equals $ 85 000. You will find that 9% of that will give you $7650 , the commission part of his pay.