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Answer:
b) Rs. 2⁹
Step-by-step explanation:
You want to know the income on day 10 if it is Rs. 1 on day 1 and doubles every day.
The sequence of income amounts is ...
1, 2, 4, 8, ....
This sequence has first term 1 and common ratio 2. The general term is given by ...
[tex]a_n=a_1\cdot r^{n-1}\\\\a_{10}=1\cdot 2^{10-1}=2^9 \qquad\text{for $a_1$=1 and $r$=2}[/tex]
On the tenth day of business his income is Rs. 2⁹, choice B.