Question 775147
 A local salesman receives a base salary of $1000 monthly.
 He also receives a commission of 9% on all sales over $1900.
 How much would he have to sell in a month if he needed to have a monthly income of $3000?
:
Let x = amt required to sell for an income or 3000 
.09(x-1900) + 1000 = 3000
.09x - 171 + 1000 = 3000
.09x + 829 = 3000
.09x = 3000 - 829
.09x = 2171
x = 2171/.09
x = $24,122.22 sales for a $3000 income