Elfreda Grossen: Let $x invested in 5% and so invested in7% is $(8000 - x)Interest earned in 5% = (x*1*5)/100 = $ (5x/100)Interest earned in 7% = (8000 - x)*7*1/100 = (56000 - 7x)/100Sum of the interests = (56000 - 2x)/100 = 496Solving this, x = $3200So an amount of $3200 has to be invested at 5% and an amount $4800 has to be invested at 7%...Show more
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