1. One credit card company sent 1,000,000 letters with the costs of $1.6 million dollars to the target market, and finally they issued 40,000 new credit cards. After one month, only 35,000 of them activated a credit statement.

   7) If we define credit users who activated a credit statement as acquired customers, how much is the acquisition cost?

   		$10/person
   		$40/person
   		$37.5/person
   		$3.75/person
   		$45.7/person