C :

#include<stdio.h>

int main()
{
    int x,y;
	double m;
	scanf("%d %d", &x, &y);
	switch (x)
	{
	    case 1:
			m = 4 * y;
			break;
		case 2:
			m = 4.5 * y;
			break;
		case 3:
			m = 5 * y;
			break;
		case 4:
			m = 2 * y;
			break;
		case 5:
			m = 1.5 * y;
			break;
	}
	printf("Total: R$ %.2lf", m);

    return 0;
}

C++ :

#include<stdio.h>
int main()
{
	int x,y;
	float X;
	scanf("%d%d",&x,&y);
	switch (x)
	{
		case 1:printf("Total: R$ %.2f",4.00*y);break;
		case 2:printf("Total: R$ %.2f",4.50*y);break;
		case 3:printf("Total: R$ %.2f",5.00*y);break;
		case 4:printf("Total: R$ %.2f",2.00*y);break;
		case 5:printf("Total: R$ %.2f",1.50*y);break;
	}
	return 0;
}