Tamika makes a 5.5% commission selling electronics. how much commission does she make if she sells a flat-screen tv for $10,000?

For this case, we should look for the 5.5% of 10,000 that the Tamika commission represents for the sale made.

For this, we make a rule of three:

10,000 ------------> 100%

x ---------------------> 5.5%

Where "x" represents the Tamika commission.

So, Tamika wins a $ 550 commission

$ 550

expression #3 is not equivalent. the others are.