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Let's break down the questions from the image:

### Question 11 (a):
Mr. Lee takes a loan from a bank. The bank charges simple interest at a rate of 5.5% per annum. At the end of 4 years, he has to pay the bank an interest of $26,400. 
- **Find the amount of his loan.**

This is a simple interest problem. We can use the formula for simple interest:

\[
I = P \times r \times t
\]

Where:
- $ I $ is the interest ($26,400),
- $ P $ is the principal (the amount of the loan),
- $ r $ is the interest rate per year (5.5% = 0.055),
- $ t $ is the time (4 years).

We can solve for $ P $ by rearranging the formula:

\[
P = \frac{I}{r \times t}
\]

### Question 11 (b):
Mrs. Lee bought a washing machine for $1,250. She paid a deposit of 25% of the price followed by 5 monthly installments.
- **Find the amount of each monthly installment.**

First, calculate the deposit as 25% of $1,250:

\[
\text{Deposit} = 0.25 \times 1250
\]

Then, subtract the deposit from the total price to find how much she still owes:

\[
\text{Amount still owed} = 1250 - \text{Deposit}
\]

Finally, divide this amount by 5 to get the monthly installment amount:

\[
\text{Monthly installment} = \frac{\text{Amount still owed}}{5}
\]

Let me calculate the answers for you.### Answers:
1. **For part (a):** The amount of Mr. Lee's loan is **$120,000**.
2. **For part (b):** Each monthly installment Mrs. Lee has to pay is **$187.50**.

Would you like more details on the calculations? Here are five related questions you can explore:

1. How is compound interest different from simple interest?
2. What would the monthly installment be if the interest rate was included in part (b)?
3. How would the amount of Mr. Lee's loan change if the interest rate was 6% instead of 5.5%?
4. What is the total amount Mrs. Lee will pay for the washing machine, including the deposit?
5. How would Mr. Lee's loan repayment differ with monthly compounding interest?

**Tip:** Always double-check if the interest is simple or compound to avoid calculation mistakes.

Mr. Lee takes a loan from a bank. The bank charges simple interest at a rate of 5.5% per annum. At the end of 4 years, he has to pay the bank an interest of $26,400. Find the amount of his loan. Mrs. Lee bought a washing machine for $1,250. She paid a deposit of 25% of the price followed by 5 monthly installments. Find the amount of each monthly installment.

Learn how to calculate the loan amount given simple interest and how to find monthly installments for a purchase with a deposit. This example covers simple interest formula and percentage-based calculations, ideal for students in Grades 8-10.

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