In 1845, many mill girls earned 40 cents a day for working 12 hours. In 2001, the minimum, or lowest allowed, wage in the United States was $5.15 hour. About how much did the mill girls earn an hour?

  3 1/3 cents per hour

Step-by-step explanation:

The 1845 earnings per hour were ...

  (40 cents)/(12 hours) = (10/3) cents/hour = 3 1/3 cents/hour

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Comment on the rate of increase

That's an average rate of increase of wages of about 3.28% per year, substantially higher than the 2.04% average rate of inflation over that period. The mill girls' wage is roughly equivalent to $0.78 per hour in 2001 dollars.

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)