A shop purchased some tennis rackets at ＄$$100$$ each, and then sold them at ＄$$150$$ each. How much did the shopkeeper earn for $$10$$ rackets? 
选项为:A:＄$$200$$  B:＄$$250$$  C:＄$$300$$  D:＄$$500$$  请回答其中一个选项.