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#include <iostream>
using namespace std;
int main()
{
    cout<<"please enter the number of units sold in this current transaction\n";
    float units, total;
    cin>>units;
    if (units)
    {
        if(units<10)
        total=units*99;
        if(units >= 10 && units < 20) {
            total=((units*99)-((units*99)*(0.20)));
        }
        else if(units >= 20 && units <50) {
            total=((units*99)-((units*99)*(0.30)));
        }
        else if(units >= 50 && units < 100) {
            total=((units*99)-((units*99)*(0.40)));
        }
        else if(units >= 100) {
            total=((units*99)-((units*99)*(0.50)));
        }
        else { 
            cout<<"enter a correct value please";
        }
    }
    cout<<total<<"\n";
}