If sean's dad paid 41.40 on a meal thet cost $36, what percent tip did he pay

Which statement describes the term economics? a. it is the study of using limited resources to fulfill wants and needs. b. it is the study of how governments fulfill the wants and needs of nations. c. it is the study of how people spend their money to fulfill wants and needs.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Which value would be a solution for x in the inequality 47-4x< 7