>>445
③
#include<iostream>
#define TAX 0.05
using namespace std;

int main()
{
int tanka,kosu;
cout<<"単価:";
cin>>tanka;
cout<<"個数:";
cin>>kosu;
cout<<"代金："<<tanka*kosu*(1+TAX)<<endl;
return 0;
}

なんだこれ…。