



 
Hi Theresa. Let's use algebra to solve the problem. Let C = the cost. Then 15% of C is your surcharge. When you add these together, you get $25,250. Remember that percentages can be written as decimals. 15% = 0.15. So we can write the question as follows:
We want to "solve for C" so we have to simplify:
Then to isolate C on the left side of the equal sign, we divide both sides by 1.15:
And this is the answer. Your cost is expected to be $21956.52, your surchange (perhaps this is your labour charge and the cost is your materials charge) is $3293.48 (that's 15% of $21956.52) for a total of $25250. Hope this helps,  


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