Mohit has some money left after spending 35%, 15% and 30% of monthly salary on rent, electricity and shopping respectively. The remaining money with Mohit increases by $\frac{1}{4}$ when a friend gives him Rs. 2300. What is the monthly salary of Mohit?

The correct answer is Rs. 46000.

Let's break down the problem step-by-step to find Mohit's monthly salary.

Step 1: Calculate the percentage of salary spent and the percentage remaining.
Mohit spends his salary on three things:
- Rent: 35% of monthly salary
- Electricity: 15% of monthly salary
- Shopping: 30% of monthly salary

Total percentage of salary spent is:
$35\%+15\%+30\%=80\%$
Let Mohit's total monthly salary be $S$.
Since he spends 80% of his salary, the percentage of salary remaining with him is:
$100\%-80\%=20\%$
Thus, the remaining money is:
$\mathrm{Remaining\; Money}=0.20\times S$

Step 2: Relate the remaining money to the money received from his friend.
According to the problem, the remaining money increases by $\frac{1}{4}$ when a friend gives him Rs. 2300.
This means that Rs. 2300 is equal to $\frac{1}{4}$ of the remaining money.
We can write this relation as:
$\frac{1}{4}\times \left(\mathrm{Remaining\; Money}\right)=2300$

Step 3: Solve for the remaining money.
To find the remaining money, multiply both sides of the equation by 4:
$\mathrm{Remaining\; Money}=2300\times 4$
$\mathrm{Remaining\; Money}=9200$
So, the remaining money is Rs. 9200.

Step 4: Solve for the monthly salary ($S$).
We know from Step 1 that the remaining money is 20% of the monthly salary:
$20\%ofS=9200$
$\frac{20}{100}\times S=9200$
$\frac{1}{5}\times S=9200$
Multiplying both sides by 5 gives:
$S=9200\times 5$
$S=46000$

Therefore, the monthly salary of Mohit is Rs. 46000.