What percent of the U.S. workforce consists of families with dual career couples?

Which of the following is not a necessary element in the formation of a contract:

A: Offer; B: Acceptance; C: Consideration; D: Performance.

Maxim Computer has a 10 percent of a $250 billion market. Maxim is the low-cost leader and realizes a 20% margin on sales, and marketing, sales, and administrative expenses equaling 10% of sales. What is Maxim's net marketing contribution?

A) $250 billion B) $25 billion C) $5 billion D) $2.5 billion E) $500 million