The consumer price index measures: .a. The prices of a fixed basket of goods and services in the United States b. The prices of goods and services in Bolivia c. The average change in prices of a fixed basket of goods and services of urban consumers d. The change in prices of a fixed basket of goods and services around the world

c. The average change in prices of a fixed basket of goods and services of urban consumers

Explanation:

It is a measure of the average change over time in the price paid by urban households for a set of consumer goods and services. It reflects the spending patterns of each of two population groups: all-urban consumers and urban wage earners and clerical workers, which include professionals, the self-employed, the unemployed, and poor persons.

u = 30

continuing your method

= +

subtract from both sides

= - thus

= -

= ⇒ u = 30