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6.Interest
medium
The compound interest (In ₹) on ₹ $800$ in $2 \frac{1}{2}$ years at $5 \%$ is
A
$105.05$
B
$104.05$
C
$106.05$
D
None of these
Solution
(b) $CI =800\left[\left(1+\frac{5}{100}\right)^{2}\left(1+\frac{\frac{1}{2} \times 5}{100}\right)-1\right]$
$=800\left[\frac{21 \times 21 \times 41}{20 \times 20 \times 40}-1\right]=\frac{800 \times 2081}{16000}$
$=₹ 104.05$
Standard 13
Quantitative Aptitude
