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 Interest rate: Sofie wants to invest $25,000 in a spa that her sister is starting

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 Interest rate: Sofie wants to invest $25,000 in a spa that her sister is starting. She will triple her investment in six years. What is the rate of return that Sofie is being promised? (Rounded to the nearest per cent.) 
a. 18% *b. 20% c. 12% d. 25%