Problem $2$:

One credit card company sent $1,000,000$ letters with the costs of $$1\mathrm{.}8$ million dollars to the target

market, and finally they issued $46,000$ new credit cards. After one month, only $41,000$ of them

activated a credit statement.

How much is the acquisition rate? $($Show two approaches$)$

How much is the acquisition cost? $($Show two approaches$)$