Totalling percentages

This task is about understanding percentages.
 
 Tavita told his mother: 
"There are 40 kids in my grade at our league club. 25% of them have been to Dreamworld, 40% have been to Waterworld, and 50% have been to Rainbows End, so 115% of my league friends have been to theme parks."
 
a)
Which place did the greatest number of people go to? ____________________
 
b)
How many people have been to Waterworld? __________
 
c) i)
Is Tavita's statement "115% of my league friends have been to theme parks" correct? __________
 
  ii)
Explain your answer for c) i).