C :

#include<stdio.h>
int main()
{
    double m,n,t,s;
    scanf("%lf%lf%lf",&n,&m,&t);
    s=m+n+t;
    if(s>=200)
        printf("%.1lf",s*0.8);
    else
        printf("%.1lf",s*0.9);
    return 0;
}

C++ :

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

int main(){
    double a,b,c,r;
    cin>>a>>b>>c;
    r = a + b + c;
    if(r >= 200){
    	r = r * 0.8;
	}else{
		r = r * 0.9;
	}
    cout<<fixed<<setprecision(1)<<r;
}
 

Java :

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		double a = sc.nextDouble();
		double b = sc.nextDouble();
		double c = sc.nextDouble();
		double sum;
		sum = a + b + c;
		double s;
		if(sum < 200){
			s = sum * 0.9;
			System.out.println(String.format("%.1f", s));
		}else if(sum >= 200){
			s = sum * 0.8;
			System.out.println(String.format("%.1f", s));
		}
	}

}

Python :

n = input().split()
a = float(n[0])
b = float(n[1])
c = float(n[2])
su = a + b + c
if su >= 200:
    print("%.1f" % (su * 0.8))
else:
    print('%.1f' % (su * 0.9))