(d) \(1\frac{1}{2}\) years
P = Rs 800, r = 10% p.a. = 5% per half year,
A = Rs 926.10, Time = 2n
\(\therefore\) 929.10 = 800\(\big(1+\frac{5}{100}\big)^{2n}\)
\(\Rightarrow\) \(\frac{9261}{8000}\) = \(\big(1+\frac{1}{20}\big)^{2n}\) \(\Rightarrow\) \(\big(\frac{21}{20}\big)^3\) = \(\big(\frac{21}{20}\big)^{2n}\)
\(\Rightarrow\) 2n = 3 \(\Rightarrow\) n = \(\frac{3}{2}\)= \(1\frac{1}{2}\) years.
