In a class test containing 10 questions, 5 marks are awarded for every correct answer, and (-2) marks are awarded for every incorrect answer and 0 for each question not attempted.
i. Ravi gets 4 correct and 6 incorrect answers. What is his score?
ii. Reenu gets 5 correct and 5 incorrect answers. What is her score?
iii. Heena gets 2 correct and 5 incorrect answers. What is her score?