One commonly used measure of ination is the annual rate of change of the Consumer Price Index (CPI). A TV new story says that the annual rate of change of the CPI is increasing. Check all of the following that must be true. The graph of CPI is concave upward. The second derivative of CPI is negative. The graph of CPI is concave downward. The second derivative of CPI is positive. The derivative of CPI is negative. The derivative of CPI is positive. Question 2 5 pts Diminishing Returns Jesaki Inc estimates that it will sell N(9:) units of product after spending $35 thousand on advertising, as given by N (3:) = 0.53 m4+ 49 3:3- 1,071 322+ 157,474. What is the point of diminishing returns? Round to the nearest dollar. $