Claire prides herself on being a smart investor. Recently she invested some money and doubled the amount.
Feeling good about herself, she spent $4000 on a trip around the world. At the same time she reinvested
what was left. After returning from her trip, she found out that the amount invested had tripled. She
threw a party that cost $5000 and put the remaining $10000 in the bank. How much money did she have at
the start?