Based on the information in the image, let's analyze each part:

1. Monthly Payment Calculation (Part a): To calculate her monthly payment for an installment loan, we typically need:
   • The principal loan amount.
   • The annual percentage rate (APR) or interest rate.
   • The loan term in months.

Since I can't see specific numerical values in the image, let’s assume general variables and solve with the following formula:

$\text{Monthly Payment} = \frac{P \times r}{1 - (1 + r)^{-n}}$

where:

• $P$ is the loan principal,
• $r$ is the monthly interest rate (annual rate divided by 12),
• $n$ is the number of payments (loan term in months).

Once I know the specific values, I can provide the exact monthly payment.

2. Total of All Monthly Payments (Part b): Once the monthly payment ($M$) is known, the total amount of all monthly payments over the term is:

$\text{Total Payments} = M \times n$

3. Total Finance Charge (Part c): The finance charge is the total interest paid over the loan term. It is calculated as the difference between the total of all monthly payments and the original loan principal:

$\text{Finance Charge} = \text{Total Payments} - P$

If you provide specific values, I can calculate these answers exactly.

Do you need clarification on any part or specific calculations?

Here are five related questions:

1. How does an increase in the interest rate affect monthly payments?
2. How would a longer loan term impact the finance charge?
3. What’s the difference between a fixed-rate and variable-rate loan?
4. How can paying extra on each installment reduce the total finance charge?
5. What are some strategies to reduce monthly payments without extending the loan term?

Tip: To reduce total finance charges, consider paying off the loan early if there’s no prepayment penalty.