Worksheet for calculating simple interest using different principal amounts, interest rates, and time periods in various currencies.

Let's solve each of these simple interest problems step by step.

The formula for Simple Interest (SI) is:

$$
\text{Simple Interest} = P \times r \times t
$$

Where:
- $ P $ = Principal amount (initial amount)
- $ r $ = Annual interest rate (as a decimal)
- $ t $ = Time in years

We'll calculate the simple interest for each case.

---

1. A principal of $2,000 at a rate of 5% for 4 years.

$$
SI = 2000 \times 0.05 \times 4 = 2000 \times 0.2 = 400
$$
✔ $400

---

2. A principal of 900 Euros at a rate of 3% for 2 years.

$$
SI = 900 \times 0.03 \times 2 = 900 \times 0.06 = 54
$$
✔ 54 Euros

---

3. A principal of 1,200 Pounds at a rate of 9% for 11 years.

$$
SI = 1200 \times 0.09 \times 11 = 1200 \times 0.99 = 1188
$$
✔ 1,188 Pounds

---

4. A principal of 10,000 Baht at a rate of 7% for 5 years.

$$
SI = 10000 \times 0.07 \times 5 = 10000 \times 0.35 = 3500
$$
✔ 3,500 Baht

---

5. A principal of 4,000 Yen at a rate of 15% for 40 years.

$$
SI = 4000 \times 0.15 \times 40 = 4000 \times 6 = 24,000
$$
✔ 24,000 Yen

---

6. A principal of 2,500 Francs at a rate of 1.5% for 6 years.

$$
SI = 2500 \times 0.015 \times 6 = 2500 \times 0.09 = 225
$$
✔ 225 Francs

---

7. A principal of 900 Yuan at a rate of 3.5% for 4 years.

$$
SI = 900 \times 0.035 \times 4 = 900 \times 0.14 = 126
$$
✔ 126 Yuan

---

8. A principal of 8,000 Pesos at a rate of 5% for 5 years.

$$
SI = 8000 \times 0.05 \times 5 = 8000 \times 0.25 = 2000
$$
✔ 2,000 Pesos

---

9. A principal of 2,000 Reals at a rate of 5% for 2 years.

$$
SI = 2000 \times 0.05 \times 2 = 2000 \times 0.1 = 200
$$
✔ 200 Reals

---

10. A principal of 100,000 Kip at a rate of 3% for 4 years.

$$
SI = 100000 \times 0.03 \times 4 = 100000 \times 0.12 = 12,000
$$
✔ 12,000 Kip

---

11. A principal of 7,500 Euros at a rate of 9% for 4 years.

$$
SI = 7500 \times 0.09 \times 4 = 7500 \times 0.36 = 2,700
$$
✔ 2,700 Euros

---

✔ Final Answers (Summary):

| Problem | Simple Interest |
|--------|------------------|
| 1 | $400 |
| 2 | 54 Euros |
| 3 | 1,188 Pounds |
| 4 | 3,500 Baht |
| 5 | 24,000 Yen |
| 6 | 225 Francs |
| 7 | 126 Yuan |
| 8 | 2,000 Pesos |
| 9 | 200 Reals |
| 10 | 12,000 Kip |
| 11 | 2,700 Euros |

---

🔍 Explanation:

- The simple interest depends only on the original principal, not on any accumulated interest.
- We converted percentages to decimals (e.g., 5% → 0.05).
- Multiply: Principal × Rate × Time → gives total interest earned.

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