为什么80

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
    double a;
    cin>>a;
    if(a<=150)
        cout<<a*0.4463;
    if((a>150)&&(a<=400))
        cout<<setprecision(4)<<150*0.4463+(a-150)*0.4663;
    if(a>400)
        cout<<setprecision(4)<<150*0.4463+250*0.4663+(a-400)*0.5663;    
    return 0;
}