I need help with 21

I must be high in Los Angeles because it is very expensive to live there. 20) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 21) Suppose that real GDP starts at 100 and grows at a rate of 6% a year for two years. In the third year real GDP would be: 21) A) 136. B) 106. C) 112.36. D) cannot be determined from the information given 22) Using the rule of 70, if the GDP per capita growth rate in the United States is 2.3%, standards of living double every: 22) A) 29 years. B) 70 years. C) 3.04 years D) 30.43 years