Algebra2
posted by :)help please on .
The piper Ad Agency claims that for every dollar spent on magazine advertising, monthly profit will increase by $5.00. You presently spend $5,000 on magazine advertising and your monthly profit is $12,000. What will be your profit if you spend $7500 on magazine advertising?
I don't understand at all how to solve this. Any advice?!

2500 * 5 = ?
Add this answer to your profit and subtract 7500. 
Thanks! So how did u get the 2500?

7500  5000 = 2500