Investment problems such as those in Exercises 75–80 can be solved by using a method similar to the one explained in Example 2, along with the simple-interest formula I = PRT.Solve each problem. Let T = 1year for each exercise.
Investing a Building Fund A church building fund has invested some money in two ways: part of the money at 4% interest and four times as much at 3.5%. Find the amount invested at each rate if the total annual income from interest is $3600.
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