C++ :

#include <bits/stdc++.h>
using namespace std;

int main() {
	double s;
	cin>>s;
	if(s>=10000.0){
		cout<<"Tax=";
		cout<<fixed<<setprecision(2)<<s*1.0*0.05;
		cout<<"yuan";	
	}else if(s>=5000.0&&s<=10000.0){
		cout<<"Tax=";
		cout<<fixed<<setprecision(2)<<s*1.0*0.03;
		cout<<"yuan";	
	}else if(s>=1000.0&&s<=5000.0){
		cout<<"Tax=";
		cout<<fixed<<setprecision(2)<<s*1.0*0.02;
		cout<<"yuan";	
	}else if(s<=1000.0){
		cout<<"Tax=";
		cout<<fixed<<setprecision(2)<<s*1.0*0;
		cout<<"yuan";	
	}
	return 0;
}