The salary of Karishma increases by Rs. 1000 every three months. If her present salary is Rs. 20000 per month, what will be her salary (per month) after 4.5 years from now?

Answer

To find Karishma's salary after 4.5 years, we can follow these steps:

### Step 1: Determine the present salary
Karishma's present salary is given as Rs. 20,000 per month.

### Step 2: Calculate the total duration in months
4.5 years can be converted into months:
\[ \text{Total months} = 4.5 \times 12 = 54 \text{ months} \]

### Step 3: Calculate the number of quarters in 54 months
Since the salary increases every 3 months (quarterly), we need to find out how many quarters are in 54 months:
\[ \text{Number of quarters} = \frac{54}{3} = 18 \text{ quarters} \]

### Step 4: Calculate the total salary increase over 18 quarters
Karishma's salary increases by Rs. 1,000 every quarter. Therefore, the total increase over 18 quarters is:
\[ \text{Total increase} = 18 \times 1000 = 18,000 \]

### Step 5: Calculate the salary after 4.5 years
Now, we add the total increase to the present salary to find the salary after 4.5 years:
\[ \text{Future salary} = \text{Present salary} + \text{Total increase} = 20,000 + 18,000 = 38,000 \]

### Final Answer
Karishma's salary after 4.5 years will be Rs. 38,000 per month.

---