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I is not so clear in fact, it doesn't say if the salary before was 30 cents and now it's 871/2 cents OR if there was an increase of wages and the minimum increase you could get was 30 cents whereas the maximum was 871/2 cents.
I think that the problem is using the 2nd way, so the minimum increase you could get per hour was 30 cents so if you work 40h you would get 30*40 = 1200 cents = 12$ more than before