In 2013 a country's consumer price index was 200. In 2014 the same country's consumer price index was 250. In 2015 the same country's consumer price index was 375. To the nearest percent what was the two-year inflation rate from 2013 to 2015? an Select one: O a. None of these O b. 2596 c. 50% d. 75% e. 87.5%