During a 5-day festival, the number of visitors tripled each day. The festival opened on a Wednesday and ends on Sunday. What was the attendance on that Sunday if on Thursday the number of visitor 345 visitors?
A. 345
B. 1,035
C. 3,105
D. 9,315
E. 27,945

Question

During a 5-day festival, the number of visitors tripled each day. The festival opened on a Wednesday and ends on Sunday. What was the attendance on that Sunday if on Thursday the number of visitor 345 visitors? 
A. 345 
B. 1,035 
C. 3,105
D. 9,315
E. 27,945

phi · Answer

Thu 345  Fri 3*Thu Sat 9*Thu Sun 27*Thu
so roughly 30*330 (for easy multiplication) = 9900 
so D 9315 is the answer.