Angelo sells sporting goods. He makes a 10% commission on every dollar of sales that he makes. One month Angelo got a commission check for $3100.

What were his sales in dollars that month???
I dont understand!

Question

Angelo sells sporting goods. He makes a 10% commission on every dollar of sales that he makes. One month Angelo got a commission check for $3100.

What were his sales in dollars that month???
I dont understand!

anonymous · Answer

anyone help???

loser66 · Answer

Let A be the amount of dollars he sales, then 
10% A = 3100, solve for A

mathmale · Answer

Loser66's suggestion is perfectly valid.

If you're not comfortable with it, you could try writing and solving an equation of proportions.

The commission rate is 10%.  So, if sales were $1.00, the commission would be 10% of that, or 10 cents, or $0.10

Ratio 1 must equal ratio 2:

  $0.10          $3100
-------- = ---------
   $1.00              x

mathmale · Answer

Are you able to solve this for x?  x is the dollar amount of the sales that earned this guy a $3,100 commission.

anonymous · Answer

i'll try!

anonymous · Answer

i think it's $13,000

mathmale · Answer

Mind sharing how you got that?

Did you use "cross-multiplication": to solve that equation for x?

The correct answer is considerablyl moe than $13,000.

anonymous · Answer

thank you!!!