Question 23 of 36 Productivity Select the correct response: 0 xplains most of the differences in the standard of living across countries. explains verv little of the differences in the standard of living across countries. explains some. but not most of the differences in the standard of living across countries. is nearly the same across countries. and so provides no help explaining differences in the standard of living across countries. Question 17 of 36 David's salary was 70,000 in 2004 and 90,000 in 2009. The consumer price index was 177 in 2004 and 270 in 2009. David's 2004 salary in 2009 dollars is Select the correct response: O $37,711.86. O $106,078 O $66,750.00. O $49,906.02