$26,000

.07 x 26K = 1820

1820 + .06 x 28K = 1820 + 1680 = 3500

Lucy S.

asked • 08/26/12A professor wants to supplement her pension with investment interest. If she invests $28,000 at 6% annual simple interest, how much would she have to invest at 7% annual simple interest to achieve a goal of $3,500 per year in supplemental income?

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$26,000

.07 x 26K = 1820

1820 + .06 x 28K = 1820 + 1680 = 3500

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