Answer:
The no. of subscribers of the magazine after 5 years is = 55713 
Explanation:
Given data
Total subscribers (N) = 72000
Drop in subscriptions in each year (R) = 5%
No. of subscribers of the magazine in 5 years is given by 

 
 
 = 55713
 = 55713 
Thus the no. of subscribers of the magazine after 5 years is = 55713