Answer:
Bob must use $4,000 newspaper ads in two numbers
Explanation:
As given in the question -
Total number of people affected by $5,000 TV ad
Total number of people affected by two $5,000 TV ad
Total number of people affected by $5,000 TV ad 
Total number of people affected by two $5,000 TV ad 
Hence, more number of people are affected by two news paper adds of $4,000
Answer:
(a) Last year taxation is paid through the current year provision
<u>Answer: </u>Natural unemployment
<u>Explanation:</u>
Natural unemployment always exists even in a healthy economy this is because the people keep changing their jobs and they even leave the current job in search of the new ones. Natural unemployment also includes other types of unemployment such as seasonal, structural and frictional unemployment types.
Also some people might possess skills that are not necessary in the labor market. The natural unemployment is still in the economy even when there is technological advancement, industry expansion. New labor forces enter into market every year and people search jobs for better opportunities.