I would do it this way.
3104.1/2.6 = -1193.88
-1193.88 = -1.19388E3 (2 s.f.)
+ 320.44 = 0.32044E3
= 0.87344E3 which rounds to 0.9. You are allowed the tenths in the 1.2E3 answer so you are allowed tenths in the answer.
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