You can 
put this solution on YOUR website! .
40x + 2.5*(48-40)*x = 1230.
Simplify and solve for x. It will be your answer.
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Also MEMORIZE this:
When you format your request in such a form
    rosalyn's regular hourly wage is $
showing that you are interested in only getting an answer with no explanations
--  then you works AGAINST YOUR BETTER INTERESTS.
In more short form and in more simple terms :  then you work AGAINST YOURSELF.
Do you need more detailed explanations ?