题解 | #计算商品打折结算金额#

#include <iostream>
#include <iomanip>
using namespace std;

int main() {
    
    double p;
    cin >> p;

    double c = 0.0;
    if (p>=5000)c=p*0.6;
    else if(p>=2000)c=p*0.7;
    else if(p>=500)c=p*0.8;
    else if(p>=100)c=p*0.9;

    // write your code here.......
    

    cout << setiosflags(ios::fixed) << setprecision(1) << c << endl;

    return 0;
}