In One Grain of Rice by Demi, a famine strikes India. Rani, a village girl, outsmarts the raja with her mathematical skills. Because the raja was selfish, he had taxed the people out of much of their rice and refused to give them food during the famine. Rani persuades the raja to give her rice each day for a month. But each day doubles the amount of rice from the previous day. For example, on the first day, he gives her one grain of rice. The second day he gives her two grains; the third day he gives her four grains; and so on. Without doing the math he agrees and in the process is forced to empty all of his storehouses to help the people he refused to help. A chart at the back of the book shows the progression of doubling the rice over thirty days.