GMAT Problem Solving
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Source: OG11th
Level: 3
If money is invested at r percent interest, compounded annually, the amount of the investment will double in approximately 
years. If Pat's parents invested $5,000 in a long-term bond that pays 8 percent interest, compounded annually, what will be the approximate total amount of the investment 18 years later, when Pat is ready for college?
- A 20000
- B 15000
- C 12000
- D 10000
- E 9000