Answer
2000 dollars
Work Step by Step
The total amount of money that he would earn for the two different scenarios is given by:
$y = .05s + 200$
OR
$ y = .15s$
We find when these are equal:
.$.15s = .05s + 200$
Now, we use PEMDAS, a method for simplification. This acronym reminds us that we must first address parentheses, and then exponents. Next, we address multiplication and division, going from left to right. Lastly, we simplify addition and subtraction from left to right. This gives:
$s = 2000$