Giridhar spends 50% of his monthly income on household items and out of the remaining spends 50% on transport 25% on entertainment, 10% on sports and saves the remaining amount of ₹900.00. What is Giridhar's monthly income?

Let Giridhar's monthly income is 200 unit.
Spend on household items $=200\times \frac{50}{100}=100$unit
Spend on transport $=50\%$ of remaining income
$=100\times \frac{50}{100}=50$ unit
Spend on entertainment $=100\times \frac{25}{100}=25$unit
Spend on sports $=100\times \frac{10}{100}=10$unit
According to the question,

$\begin{array}{l}(100+50+25+10)+₹900=200\end{array}$unit

$\begin{array}{l}\Rightarrow ₹900=200-185\end{array}$

$\begin{array}{l}\Rightarrow ₹900=15\end{array}$unit

 $\begin{array}{l}\Rightarrow 1\text{ unit }=₹60\\ \therefore 100\text{ unit }=₹6,000\end{array}$

So, Giridhar's monthly income is $₹6,000$.