C :

#include <stdio.h>
int main(){
    int a;
    scanf("%d",&a);
    
   float q;
    if(a <= 10){
    	q = 2.5;
    }else{
    	q = 2.5 + (a-10) * 1.5;
    }
    
    printf("%.2f",q);
    return 0;
}

C++ :

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	double x,i;
	cin>>i;
	if(i<=10){
		x=2.5;
	}else if(i>10){
		x=2.5+(i-10)*1.5;
	}
	cout<<fixed<<setprecision(2)<<x<<endl;
}

Pascal :

var n:longint;
    s:real;
begin
  read(n);
  s:=0;
  if n<=10 then s:=2.5
   else s:=(n-10)*1.5+2.5;
   writeln(s:0:2);
end.

Java :

import java.text.DecimalFormat;
import java.util.Scanner;
public class Main{
	public static void main(String[] args) {
		Scanner scanner=new Scanner(System.in);
		int w=scanner.nextInt();
		float s=0;
		if(w<=10){
			s= (float) 2.5;
		}else{
			s=(float) ((float)(w-10)*1.5+(float)2.5);
		}
		DecimalFormat df=new DecimalFormat("#0.00");
		System.out.println(df.format(s));
	}
}

Python :

x = int( input() )
if x <= 10:
    y = 2.5
else:
    y = 2.5 +(x - 10) * 1.5

print('%.2f' % y)