Operating return on assets is equal to the operating profit margin times total asset turnover

The function of money that expresses prices and contracts for deferred payments in terms of the monetary unit is referred to as:

a. store of purchasing power b. standard of value c. medium of exchange d. credit money

Which is not a quality of a convenience sample?

A) unrestricted samples B) non-probability samples C) the most difficult samples to arrange D) the most unreliable samples