Code:

#include <iostream>

using namespace std;

int main(void)

{

int choice;

cout<<"\n Silver Express Theme Park Pvt. Ltd.";

cout<<"\n===========================";

cout<<"\n 1.Regular Adult";

cout<<"\n 2. Student";

cout<<"\n 3.Family Ticket";

cout<<"\n Enter the type of ticket which you want: ";

cin>>choice; //input taking

if(choice==1){ //adult tickets total amount calculation
int count;
cout<<"Enter no.of persons:";
cin>> count;
if(count>0)
cout<<"Total amount due is :"<< count*30;
else
cout<<"no.of persons must be greater than zero";
}
else if(choice==2){ //student tickets total amount calculation
int count;
cout<<"Enter no.of persons:";
cin>> count;
if(count>0)
cout<<"Total amount due is :"<< count*25;
else
cout<<"no.of persons must be greater than zero";
}
else if(choice==3){ //family tickets total amount calculation
int count;
cout<<"Number of additional children in the group(more than 2):";
cin>> count;
if(count>0)
cout<<"Total amount due is :"<< (count*15)+75;
else
cout<<"no.of persons must be greater than zero";
}
else{ //invalid option
cout<<"Invalid Option";

}
}