A owner of a mart earns an income of Re 1 on the first day of his business. On every subsequent day, he earns an income which is just double of that made on the previous day. On the 10th day of business, he earns an income of:\nOptions:\n(A) 18\n(B) 21\n(C) 22\n(D) 20\n(E) 30
Please answer the following question by reasoning step-by-step.
(A)
2nd day he earns = 2(2 – 1)\n3rd day he earns = 2(3 – 1)\nOn 10th day he earns 2(10 -1) = 18 rupees.

Therefore, the answer is (A)