Rohan spends Rs x daily and saves Rs y per week. What is his income after 3 weeks?

Options

A. Rs (21x + 3y)
B. Rs (23x + 9y)
C. Rs (21x + 9y)
D. Rs (7x +3y)

Answer

To find Rohan's income after 3 weeks, we can break down the problem step by step.

### Step-by-Step Solution:

1. **Identify Daily Spending**:
Rohan spends Rs. x daily.

**Hint**: Remember that daily spending needs to be multiplied by the number of days in a week to find weekly spending.

2. **Calculate Weekly Spending**:
Since there are 7 days in a week, Rohan's weekly spending will be:
\[ \text{Weekly Spending} = 7 \times x = 7x \]

**Hint**: Think about how many days are in a week when calculating weekly expenses.

3. **Identify Weekly Savings**:
Rohan saves Rs. y per week.

**Hint**: Savings are given directly per week, so you can use this value for further calculations.

4. **Calculate Savings After 3 Weeks**:
To find out how much Rohan saves after 3 weeks, we multiply his weekly savings by 3:
\[ \text{Savings After 3 Weeks} = 3 \times y = 3y \]

**Hint**: Multiply the weekly savings by the number of weeks to find total savings over that period.

5. **Calculate Total Spending After 3 Weeks**:
To find out how much Rohan spends after 3 weeks, we multiply his weekly spending by 3:
\[ \text{Spending After 3 Weeks} = 3 \times (7x) = 21x \]

**Hint**: Just like savings, spending can also be calculated by multiplying weekly spending by the number of weeks.

6. **Calculate Total Income**:
Rohan's total income after 3 weeks can be calculated by adding his total spending and total savings:
\[ \text{Total Income} = \text{Total Spending} + \text{Total Savings} = 21x + 3y \]

**Hint**: Total income is the sum of what he has spent and what he has saved.

### Final Answer:
Rohan's income after 3 weeks is:
\[ \text{Income} = 21x + 3y \]