The last homework assignment, con't

 
 
//Begin calculateCosts
void calculateCosts(int sq_yds,
                    float cost_per_sq_yd,
                    float labor_per_sq_yd,
                    float prep_cost,
                    float &cost_carpet,
                    float &cost_labor,
                    float discount_rate,
                    float &discount,
                    float &tax,
                    float &charge)
{
   //calculate the total cost of carpet
   cost_carpet = sq_yds * cost_per_sq_yd;

   //calculate the total cost of labor
   cost_labor = (sq_yds * labor_per_sq_yd) + prep_cost;

   //calculate the customer's discount
   discount = (cost_carpet * discount_rate);

   //calculate the tax for current customer
   tax = (cost_carpet - discount) * TAX_RATE;

   //calculate the total charge to current customer
   charge = (cost_carpet - discount + tax + cost_labor);

}
//End calculateCosts