Trailing zeros after a decimal point are not normally written. As trailing zeros have been written they must be significant; thus 9.1000 × 10^4 has 5 sig fig.
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the answer will be 961.6 and it will have 4 significant figures mah friend :)
75.6 times 12.33 = 932.148 correct to 6 significant figures
341.2
20.865
The least number of significant figures in any number of the problem determines the number of significant figures in the answer which, in this case, would be 932.