Question 189708
Let x=total sales each person must make

Mike's salary = 500 + 0.03x
Zach's salary = 700 + 0.025x

500+0.03x=700+0.25x

Subtracting 500 from each side, we get:

500-500+0.03x=700-500+0.025x

0.03x=200+0.025x

Subtracting 0.025x from each side, we get:

0.03x-0.025x=200+0.025x-0.025x

0.005x=200

Dividing both sides by 0.005, we get:

0.005x/0.005=200/0.005

x=40000

Therefore Mike and Zach needs to make $40,000 in sales so they get equal salaries.

To check:

Mike's Salary = 500 + 0.03(40000)=500 + 1200=1700
Zach's Salary = 700 + 0.025(40000) = 700 + 1000=1700