Calculating the Probability from a Given Situation

An instructor has a test bank consisting of 300 easy true-false questions, 200 difficult true-false questions, 500 easy multiple choice questions and 400 difficult multiple choice questions.
If a question is selected at random from the test bank, what is the probability that it will be:
a) An easy question
b) An easy multiple choice question
c) An easy question, given that it is a multiple choice question.

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... = 800
P(easy question) = 800/ 1400
= 4/7

b) P(easy MCQ) = 500 / 1400
...