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Answer:
70% Increase.
Explanation:
Bar graph showing the percentage of U S homes with electricity for the years 1910, 1920, 1930. In 1910, all homes and urban homes were at 10 percent. In 1920, all homes were 35 percent and urban homes at 50 percent. In 1930, all homes were at 70 percent and urban homes over 80 percent.