stuck!

[NezieM595]

Carla earns a base salary of $30,000 plus 10% commission on her total sales revenue exceeding $50,000. How much did she make on commission this year?

1) If her total sales revenue had been 25% higher, her commission would have been 20% higher

In the solution "...From the question, we know that c = 0.1(r – 50,000). From the statement, we know that 1.2c = 0.1(1.25r – 50,000). We know that we have 2 linear equations relating our 2 variables, so we will get one unique solution." was stated.


The stem is clear but I dont get the statement. her commission would have been 20% higher than what exactly? how did the equation "1.2c = 0.1(1.25r – 50,000)" come about? ofcourse i know it's from the statement. what is going on here!? The statement totally doesnt make any sense to me. Can someone go straight to the point and illustrate what the statement is talking about? Or was it a one off typo from M-GMAT?
Pls I need an urgent reply. I'm stuck. thanks

[RonPurewal]

hi,
as per the forum rules, we need a citation of the original source of this problem. thanks.

[RonPurewal]

i see that you mentioned "M-GMAT". if this is one of our questions, this is the wrong folder for it.

on this forum there are 2 folders for MPrep questions: one for problems from the CAT exams, and another for problems from all other MPrep materials (strategy guides, etc.)

so, please...
...search the forum for the problem first;
...if you don't find it, post your query in the appropriate folder. thanks.