Hi,

How much  was invested in the tax free account

Question states***

 .085x + .11(9000-x) = 840  

      990 - 840 = .025x

          150/.025 = x = $6000 invested in the tax free account

CHECKING our answer***

 .085*6000 + .11*3000 = $510 + $330 = $840

Wish You the Best in your Studies.

 

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