sam makes $400 per week plus $20 commission on each new cell phone plan she sells. write an equation to determine how many new planes she sold to earn $680 last week.
400+20x=680
We determine the commission like this:
680 - 400=280
If Sam sold x number of cell phones, then we have.
x * 20=280, we divide both sides by 20 and we get,
x=280/20=14 cell phones that Sam has to sell. So we have,
(14 X $20) +$400=$680
sam makes $400 per week plus $20 commission on each new cell phone plan she sells. write an equation to determine how many new planes she sold to earn $680 last week.
