Answer:
 236,859 people visited the water park the year it opened.
Step-by-step explanation:
426,731 - 102,865= 323,866 the amount of people that visited last year
323,866 - 87,007 = 236,859 the amount of people that visited the water park the year it opened
 
        
             
        
        
        
(x,y)
x=input
y=output
example
we see
g=(1,2)
theefor
g(1)=2
a. 
f(4)=1
g(1)=2
g(f(4))=2
b.
g(-2)=4
f(4)=1
f(g(-2))=1
c. 
f(3)=5
g(5)=5
f(5)=0
f(g(f(3)))=0
        
             
        
        
        
12 percent more than last time