C++ :

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
	long double a;
	cin>>a;
	if(a>=10000)cout<<fixed<<setprecision(2)<<"Tax="<<a*0.05<<"yuan";
	else if(a<10000&&a>=5000)cout<<fixed<<setprecision(2)<<"Tax="<<a*0.03<<"yuan";
	else if(a<5000&&a>1000)cout<<fixed<<setprecision(2)<<"Tax="<<a*0.02<<"yuan";
	else cout<<fixed<<setprecision(2)<<"Tax="<<a*0<<"yuan";
	
}