A man purchases 8 pens for Rs.9 and sells 9 pens for Rs.8, how much profit or loss does he make?\nOptions:\n(A) 15\n(B) 66\n(C) 88\n(D) 1\n(E) 12
Please answer the following question by reasoning step-by-step.
(A)
90 * 10/60 = 15 kmph.

So, the final answer is (A)