Answer:
P = Rs 4,096 \[R=12\frac{1}{2}%\] per annum \[=\frac{25}{2}%\] per annum \[=\frac{1}{2}\times \frac{25}{2}%\] per half year \[n=18\] months \[=\frac{18}{6}\] half years = 3 half years. \[\therefore \] \[A=P{{\left( 1+\frac{R}{100} \right)}^{n}}\] \[=4,096\,{{\left( 1+\frac{25}{4\times 100} \right)}^{3}}\] \[=4,096{{\left( 1+\frac{1}{16} \right)}^{3}}\] \[=4,096\,{{\left( \frac{17}{16} \right)}^{3}}\] \[=4,096\times \frac{17}{16}\times \frac{17}{16}\times \frac{17}{16}\] = Rs 4,913 Hence, the required amount is Rs 4, 913.
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