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Suppose an investment of $8,200 doubles in value every 7 years. How much is the investment worth after 28 years?

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$131,200

28÷7=4

1)$8,200 - after 7 years

8200×2=16,400

2)$16,400 - after 7 years

16,400×2=32,800

3)$32,800 - after 7 years

32,800×2=65,600

4)$65,600 - after 7 years

$65,600×2=131,200

After 28 years, the investment worth is $131,200

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