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course/5-interfaces/exercises/2-implements/readme.md

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+# Interface Implementation
+
+Interfaces are implemented *implicitly*.
+
+A type never declares that it implements a given interface. If an interface exists and a type has the proper methods defined, then the type automatically fulfills that interface.
+
+## Assignment
+
+At Textio we have full-time employees and contract employees. We have been tasked with making a more general `employee` interface so that dealing with different employee types is simpler.
+
+Add the missing `getSalary` method to the `contractor` type so that it fulfills the `employee` interface.
+
+A contractor's salary is their hourly pay multiplied by how many hours they work per year.