Please help me out on this!!

Acompany made a profit of 75000 over a period of 6 years on an initial investment of 15000 what is the annual roi

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Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?