The CIA World Factbookt estimates the economic performance of countries. One such figure is the gross domestic product (GDP), which is the annual market value of the goods and services produced in that country. In 2015 the GDP of China was about 11.0 trillion dollars. It is predicted to grow by about 7% each year. Use this prediction to determine how long it will take for the economy of Japan to double in size from its level in 2015. (Round your answer to the nearest year.) O a. 15 years O b. 7 years O c. 10 years d. 2015 years