Let's go through the problem together.

Part a: How much money did Kheri save in the first week?

• Kheri saved $16 from her allowance and $54 from her job.
• She spent $5 on lunch and $2 on the bus.

First, calculate the total savings before expenses:

$16 + 54 = 70 \text{ dollars}$

Then, subtract her total expenses:

$70 - (5 + 2) = 70 - 7 = 63 \text{ dollars}$

So, Kheri saved $63 in the first week.

Part b: How much money did Kheri save in the second week?

• Kheri saved $103.
• She spent $2 on the bus and $4 on lunch.

First, subtract her total expenses:

$103 - (2 + 4) = 103 - 6 = 97 \text{ dollars}$

So, Kheri saved $97 in the second week.

Would you like any additional details or explanations? Here are some related questions you could explore:

1. How would Kheri’s total savings over the two weeks compare if her expenses had doubled?
2. If Kheri had saved an additional $10 each week, how much would she have saved in total?
3. What would her savings be if she had no expenses in both weeks?
4. How much would Kheri need to save in the third week to have $300 saved in total?
5. If Kheri decided to reduce her spending by 20%, how much more would she save in the second week?

Tip: Always keep track of both income and expenses when calculating savings to get an accurate result!