#include
int main()
{
double total_price = 0.0;
int type = 0;
int quantity = 0;
const double type1_price = 3.50;
const double type2_price = 5.50;
type = 9;
quantity = 12.12;
total_price = quantity*(type1_price + (type-1)*(type2_price-type1_price));
printf("The price for %d of type %d is $%.2f\n",quantity, type, total_price);
}