
Mary Ann F. answered 12/07/14
Tutor
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Math & Science... Algebra and Geometry specialist
The shampoo and blowout cost the groomer $19.00 to do, but he only charges $12.00 so he loses $7.00. (Think of this as him starting "in the hole" - he has to make this up, plus some more to come out ahead.)
If he charges $25.00 for the other two services which only cost him $9.00, he makes $16.00. The two transactions together net the groomer $16.00 - $7.00, or $9.00....