TypeError: can't multiply sequence by non-int of type 'str'

[Beatenberg]

When I add int to both cost[0] * cost[1], the code repeats itself and never multiplies them. Why is this happening?

1 2	def Pass_Calculate(cost):     return int(cost[0]) * int(cost[1])

[sparkz_alot]

When does 'Pass_Total()' come into play?

[Beatenberg]

Pass_Total() comes into play after Pass_Discount()

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def Pass_Show():     print("Aussie Pass!")     print("Please select a package and discount depending on age.")     print("E.g. Package = 7")     Pass_Package()   def Pass_Package():     print("7 Day Pass – $139.95")     print("14 Day Pass - $239.95")     print("30 Day Pass - $500.00")     Pass_Discount()   def Pass_Discount():     print("Children (Under 15) - 60% off")     print("Students (Over 15 & less than 22) - 40% off")     print("Seniors (60 or over) - 50% off")     Pass_Total()   def Pass_Total():     cost = Pass_Cost()     total = Pass_Calculate(cost)     print("The total cost is: $" + str(total))   def Pass_Cost():#User inputs the type of package they suit and discount     cost=list()     package = input('Package: ')     if package == '7' or '14' or '30': #If they enter those values they will move onto choosing their discount         print("Proceed...")         cost.append(package)               if package not in('7','14','30'):         Pass_Cost()#If they do not enter any of those values they will be prompted to ask again           p = int(package)         discount = input("Discount: ")         if discount == "Children":         discount = 0.60         cost.append(discount)         Pass_Calculate(cost)     if discount == "Students":         discount = 0.50         cost.append(discount)         Pass_Calculate(cost)     if discount == "Seniors":         discount = 0.40         cost.append(discount)         Pass_Calculate(cost)     if discount not in ("Children","Students","Seniors"):         Pass_Cost()       d = int(discount)           return p, d             def Pass_Calculate(cost):     return float(int(cost[0])) * float(int(cost[1])) #Calculates the cost from their chosen package and discount e.g. 7 * 0.6                     #7 being the chosen package (7 Day Pass) and 0.6 being the Children discount (60%)         Pass_Show()