pavel-trufanov/invoice

Developer test

Create a method for calculating invoice total, which returns invoice total and prints out invoice rows.

calculateInvoiceTotal(usage, priceList, package)

Package S 10 minutes 50 sms 5 eur

Package M 50 minutes 100 sms 10 eur

Package L 500 minutes 500 sms 20 eur

Price list 1 minute - 0.2 eur 1 sms - 0.3 eur

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Assumptions:

• Package price is included anyway even though there is no usage
• Amount for package invoice row is always equal to 1, meaning 1 package
• The customer is billed for each extra traffic amount that exceeds the amounts included into package according to a price list
• Price list and package data is considered as always present in application scope, so there is no specific logic to check if it is missing.