Ravi works as a driver in the USA and for the past month, his income fluctuated as 
follows. The average income for the first 5 days of a month was $200, for the next 10 
days it was $240, for the next 10 days it was $300 and for the remaining days of the
month, it was $100. What was the average income (in $) per day for the last month? 
a. 300
b. 230
c. 400
d. Cannot be determined


To determine Ravi's average income per day for the last month, we need to calculate his total income for the month and then divide it by the number of days in the month. Since the exact month is not specified, let's assume it's a typical month with 30 days.

Here's the breakdown of his income:

1. First 5 days: Average income = $200 per day
\[ \text{Total for 5 days} = 5 \times 200 = \$1000 \]

2. Next 10 days: Average income = $240 per day
\[ \text{Total for 10 days} = 10 \times 240 = \$2400 \]

3. Next 10 days: Average income = $300 per day
\[ \text{Total for 10 days} = 10 \times 300 = \$3000 \]

4. Remaining 5 days: Average income = $100 per day
\[ \text{Total for 5 days} = 5 \times 100 = \$500 \]

Now, we sum up his total income for the month:
\[ \text{Total income} = 1000 + 2400 + 3000 + 500 = \$6900 \]

Finally, we divide this total by the number of days in the month to find the average income per day:
\[ \text{Average income per day} = \frac{6900}{30} = \$230 \]

Therefore, the correct answer is:
b. 230

Would you like more details or have any questions? Here are some related questions you might find interesting:

1. If Ravi worked 31 days in a month, what would be his average income per day?
2. How would the average income change if the income for the remaining days was $150 instead of $100?
3. What is the total income if Ravi worked for only 25 days under the same conditions?
4. If the first 5 days' income increased by 10%, what would be the new average income per day for the month?
5. How does the number of working days in a month affect the average income calculation?

**Tip:** When calculating averages, ensure you account for the correct number of items (or days) over which the total is distributed.

Learn how to calculate the average income per day for a driver based on varying daily incomes over a month. This problem involves arithmetic operations and averages. Suitable for high school students.

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