Imagine a question and stream-of-consciousness explanation for which this is the answer: (A)

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Question: An enterprising businessman 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 20th day of business, he earns an income of:
Options:
(A) Rs 219
(B) Rs 220
(C) Rs 20²
(D) Rs 20
(E) Rs 30
Stream-of-consciousness: 2nd day he earns = 2 = 2(2 – 1)
3rd day he earns = 2(3 – 1)
On 20th day he earns 2(20 -1) = 219 rupees