What is the output of this tricky program?

Interesting problem from C Programming tricks:

//Program tested on Microsoft Visual Studio 2008 - Zahid Ghadialy
#include<iostream>

using namespace std;

int main()
{
  int a=2,*f1,*f2;
  f1=f2=&a;
  *f2+=*f2+=a+=2.5;
  *f1+=*f1+=a+=2.5;
  cout<<"a = "<<a<<"    *f1 = "<<*f1<<"    *f2 = "<<*f2<<endl;

  return 0;
}

What is the final value of a, *f1 and *f2. Choose one from below:
a) 18,18,18
b) 10,10,10
c) 72,72,72
d) 64,64,64
e) 26,26,26

The answer is...
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