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Let's solve the two problems shown in the image.

### Problem 11:
A car had an original value of P750,000 but decreased to P540,000 in 3 years. What is the ratio of decrease to the original value?

**Solution:**
The decrease in value is calculated as:
\[
\text{Decrease} = \text{Original Value} - \text{New Value} = 750,000 - 540,000 = 210,000
\]
Now, the ratio of the decrease to the original value is:
\[
\text{Ratio} = \frac{\text{Decrease}}{\text{Original Value}} = \frac{210,000}{750,000} = 0.28
\]
So, the ratio of decrease to the original value is **0.28** or **28%**.

---

### Problem 12:
In a time deposit of his account, Ramsie earns 7.5% interest on P320,000. How much money will be earned in interest?

**Solution:**
The formula to calculate simple interest is:
\[
\text{Interest} = \text{Principal} \times \text{Rate}
\]
Here, the principal (P) is P320,000, and the interest rate (R) is 7.5% (or 0.075). Substituting these values in:
\[
\text{Interest} = 320,000 \times 0.075 = 24,000
\]
So, Ramsie will earn **P24,000** in interest.

---

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### 5 Related Questions:
1. How do you calculate percentage decrease over time?
2. What is the difference between simple and compound interest?
3. How does the rate of depreciation affect an asset's value over time?
4. If Ramsie left his interest in the account for another year, how much total would he have after 2 years?
5. Can the ratio of decrease be expressed in fraction form, and if so, what is its simplest form?

### Tip:
When dealing with percentages and ratios, always express your values in the same units (e.g., money, distance, etc.) to avoid confusion and ensure accurate calculations.

Solve for the following: 11. A car had an original value of P750,000 but decreased in value to P540,000 in 3 years. What is the ratio of decrease to the original value? 12. In a time deposit of his account, Ramsie earns 7.5% interest on P320,000. How much money will be earned in interest?

Learn how to calculate the ratio of decrease for a car's value from P750,000 to P540,000 and how much interest Ramsie earns on a P320,000 deposit with a 7.5% interest rate. This problem covers basic financial math concepts, including percentage decrease and simple interest.

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