$ represents addition and * represents subtraction,what is the value of the following expression?
15 * 5 $ 15 $ 10 $ 30 * 25 * 35 * 25 $ 20 * 25 * 20  Pick:
A) -15 B) -35 C) -55 D) -45 E) -65
15-5+15+10+30-25-35-25+20-25-20   =10+15+10+30-25-35-25+20-25-20   =25+10+30-25-35-25+20-25-20   =35+30-25-35-25+20-25-20   =65-25-35-25+20-25-20   =40-35-25+20-25-20   =5-25+20-25-20   =-20+20-25-20   =0-25-20   =-45   ANSWER:-45
<result>D</result>
$ represents addition and * represents subtraction,what is the value of the following expression?
15 * 5 $ 15 $ 10 $ 30 * 25 * 35 * 25 $ 20 * 25 * 20