C :

#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

void main(int argc, char *argv[]) {
	int a[10];
	int i,n,y;
	double s;
	s=0;
	scanf("%d",&n);
	for(i=0;i<n;i++){
		scanf("%d",&a[i]);
	}
	for(i=0;i<n;i++){
		s=s+a[i];
		
	}

	for(i=0;i<n;i++){ 
	  if(s>100&&a[i]==a[n-1])
			printf("%.2f",(s-100)*0.9+100);
	}
	}

C++ :

#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

int main(){
	int a[100],n,s=0,m,x;
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>a[i];
		s+=a[i];
	}
	cout<<fixed<<setprecision(2)<<100+((s-100)*0.9)<<endl;
	
}

Python :

n=int(input())
l1=list(map(int,input().split()))
def qiuHe(n):
    s=0
    for i in l1:
        s+=i
    return s
s=qiuHe(l1)
if s>100:
    s=(s-100)*0.9+100
    print('%.2f'% s)
else:
    print(s)