Question 243374
You can think of this as just like any mixture.  You're looking for the proportion of each kind of candy.  In this case the proportion is 3 to 5.  Since 3+5 = 8, the proportion of Good & Plenty is 3/8 and the proportion of Sweet Treats is 5/8.  The cost per pound for this proportion is simply:
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{{{
(3/8) * 2.49 + (5/8) * 2.89 = 2.74
}}}
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So you would charge the buyer 2.74/lb for this mixture that is 3 parts Good & Plenty and 5 parts Sweet Treats.