A=P\(\big(1+\frac{r_1}{100}\big)\big(1+\frac{r_2}{100}\big)\big(1+\frac{r_3}{100}\big)\)
\(\Rightarrow\) A = 10000\(\big(1+\frac{4}{100}\big)\big(1+\frac{5}{100}\big)\big(1+\frac{6}{100}\big)\)
=10000 x \(\frac{104}{100}\) x \(\frac{105}{100}\) x \(\frac{106}{100}\) = Rs 11575.20
\(\therefore \) C.I. = Rs 11575.20 – Rs 10000 = Rs 1575.20.