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I don't understand please helpFirst box options: Increase of decreased

I don't understand please helpFirst box options: Increase of decreased-example-1
User Sanyo
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The initial investment in 1985 was $31400, while the final amount in 1990 was $38900. Then the value of this investment increased at a rate of (38900 - 31400)/(1990 - 1985) = 1500 dollars per year.

User HDiamond
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