TAX_RATE = 5.5

def calculate_tax_for(item_price)
  item_price * (TAX_RATE / 100)
end

puts("How many items are you purchasing?")
total_items = gets.chomp.to_i

item_quantities = []
item_prices = []

total_items.times do |i|

  puts("Enter price for item #{i + 1}:")
  item_prices << gets.chomp.to_f
  
  puts("Enter quantity for item #{i + 1}: ")
  item_quantities << gets.chomp.to_i 
  
end

subtotal = 0
tax = 0

item_prices.each do |price|
  item_quantities.each do |qty|
    subtotal += price * qty
    # subtotal = subtotal + price * qty
    tax += calculate_tax_for(subtotal)
    # tax = tax + (price * qty) * (TAX_RATE / 100)
  end
end

puts("Subtotal: #{subtotal.round(2)}€")
puts("Tax: #{tax.round(2)}€")
puts("Total: #{(subtotal + tax).round(2)}€")