purchase.rb

  def total_price
    tp = Money.new(0.0, appropriate_package.base_price_currency)
    puts "tp = #{tp.currency} #{tp.inspect}"
    addon_packages.each do |pkg|
      puts "pkg.base_price = #{pkg.base_price.currency} #{pkg.base_price}"
      tax = pkg.tax_price(state_or_province).exchange_to(appropriate_package.base_price_currency)
      puts "pkg.tax_price(state_or_province) = #{tax.currency} #{tax}"
      tp += pkg.base_price.exchange_to(appropriate_package.base_price_currency) + tax
      puts "tp = #{tp.currency} #{tp.inspect}"
    end
    tp + appropriate_package.billing_price(state_or_province)
  end