An article is listed at $\text{Rs. }900$. A customer pays $\text{Rs. }726.75$ for it after getting two successive discounts. If the rate of first discount is $15\%$, the rate of the second discount is ______.

Given:Marked Price ($\text{MP}$) = $\text{Rs. }900$ First Discount = $15\%$ Final Selling Price ($\text{SP}$) = $\text{Rs. }726.75$ Price after the first discount:
$${\text{Price}}_1=900\times \left(1-\frac{15}{100}\right)=900\times 0.85=\text{Rs. }765$$
Let the second discount rate be $d\%$.The price after the second discount equals the final selling price:
$$765\times \left(1-\frac{d}{100}\right)=726.75$$
$$1-\frac{d}{100}=\frac{726.75}{765}$$
$$1-\frac{d}{100}=\frac{72675}{76500}$$
Dividing $72675$ by $765$:
$$72675÷765=95$$
So,
$$1-\frac{d}{100}=\frac{95}{100}=0.95$$
$$\frac{d}{100}=1-0.95=0.05$$
$$d=5\%$$
Thus, the rate of the second discount is $5\%$.