3.6

#include<iostream>

int main()
{
	using namespace std;
	
	long kilometer,liter;

	cout << "Please enter the number of kilometers: ";
	cin >> kilometer;
	cout << "Enter the number of liters: ";
	cin >> liter;
	
	float consumption_of_liter = liter / (kilometer / 100);
	cout << "So each hundred of kilometers will consume " << consumption_of_liter << " liters oil.\n";

	return 0;

}