The arithmetic average cost of the three items that Emma purchased from a grocery store is $25. No sales tax was charged on any item that cost less than $40. A sales tax of 8 percent was charged on any item that cost $40 or more. What is the sales tax on the three items that Emma purchased? (1) The most costly item that Emma purchased was $50. (2) The least costly item that Emma purchased was $5.

Data Sufficiency questions are exclusive to the GMAT.

Each Data Sufficiency question poses a question, followed by two statements. Your task is to evaluate the statements to determine at what point there is or is not sufficient information to answer the question.

Unlike the Problem Solving questions, you do not actually have to answer the question posed. Instead, you select one of five fixed answer choices that offer different options about the sufficiency of the information provided in the two statements.