Solve Problems 25–48. Because you are practicing a procedure, you must show all of your work. Start with a verbal description and end with a sentence answering the question.

A professional gambler reported that at the end of the first race at the track he had doubled his money. He bet $30 on the second race and tripled the money he came with. He bet $54 on the third race and quadrupled his original bankroll. He bet $72 on the fourth race and lost it, but still had $48 left. With how much money did he start?