Monthly expenditure of Ritvik decreases from ₹12,800 to ₹11,712. Find the percentage decrease in his expenditure.

The correct answer is 8.5%.

Step 1: Understand the given values
Initial expenditure = ₹12,800
Final expenditure = ₹11,712

Step 2: Calculate the decrease in expenditure
Decrease in expenditure = Initial expenditure - Final expenditure
Decrease in expenditure = 12800 - 11712 = 1088

Step 3: Calculate the percentage decrease
The percentage decrease is given by the formula:

$\text{Percentage Decrease}=\left(\frac{\text{Decrease in Expenditure}}{\text{Initial Expenditure}}\right)\times 100$

Substitute the values into the formula:

$\text{Percentage Decrease}=\left(\frac{1088}{12800}\right)\times 100$

$\text{Percentage Decrease}=\frac{1088}{128}=8.5\%$

Thus, the percentage decrease in Ritvik's monthly expenditure is 8.5%.