Hi, 

Let x represent amount invested at 8%

then ($42,000 - x) would be amount invested at 3%

Question states

.08x + .03($42,000-x) = $2960

.05x = $2960 - .03*$42,000

.05x = $2960 - $1260

.05x = 1700

x = $34,000, amount invested at 8%

checking our answer

$2720 + $240 = $2660 

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