The graph shows the percentage of us homes with electricity. A bar graph where the x axis shows the years 1910, 1920, 1930 and the y axis shows the percentage of homes, from 0 to 90. For all homes: 1910, 10%; 1920, 35%; 1930, 67%. For urban homes: 1910, 10%; 1920, 48%; 1930, 83%. Between 1910 and 1930, what was the approximate increase in us homes with electricity? 30% 40% 55% 75%.