A Newspaper Is Launching a New Advertising Campaign in Order $S ^ { \prime } ( t ) = 80 t ^ { 1 / 2 }$

Multiple Choice

A newspaper is launching a new advertising campaign in order to increase the number of daily subscribers. The newspaper currently (t = 0) has 26,000 daily subscribers and management expects that number, S(t) , to grow at the rate of $S ^ { \prime } ( t ) = 80 t ^ { 1 / 2 }$ subscribers per day, where t is the number of days since the campaign began. How long (to the nearest day) should the campaign last if the newspaper wants the number of daily subscribers to grow to 49,000?

A) 69 days
B) 57 days
C) 33 days
D) 44 days