What is the number of residential consumers of electricity in 1920? in 1930

In 1920, only 35 percent of homes had electricity; by 1930, the number was 68 percent

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.