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1904 Plus Some Change

In the United States the average cost of living in 1860 was $115.191 per person, and in 1904, $97.192. How much less on the average did a year’s living for a family of 5 persons cost in 1904 than in 1860?

Solution:

Source: William Milne, Progressive Arithmetic, Second Book, NY: American Book Co., 1907