You can
put this solution on YOUR website! .
Let x = sales, in dollars.
Then your equation is
1-st company = 2-nd company
0.04x = 420 + 0.02x
Simplify and find x :
0.04x - 0.02x = 420
0.02x = 420
x =
=
= 21000 dollars.
ANSWER. The sales under the problem's question should be $21000.
Solved.