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 OK. Let's think. Some random thoughts first:
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2nd day he earns = 2(2 – 1)\n3rd day he earns = 2(3 – 1)\nOn 10th day he earns 2(10 -1) = 18 rupees The answer: (A).
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