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Carbon Content of Steel

A steel contains 55% alpha-ferrite and 45% gamma-ferrite or austenite at 750 degrees Celsius. What is the carbon content of steel?

a) 0.25%
b) 0.5%
c) 0.28%

****This is how the problem was written however I'm not sure if it makes sense that 55% and 45% are supposed to be 0.55% and 0.45%**** My guess at the answer is (b), can you explain?

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The answer is c.

The carbon content of alpha-ferrite at 750 is 0.02%, so the ...

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$2.19