For simple interest,  the formula can also be I=P+Prt

There seems to be a slight confusion in your formula. The correct formulas for simple interest are:

1. **Interest Only:**
\[ I = P \times R \times T \]

2. **Total Amount (Principal + Interest):**
\[ A = P + (P \times R \times T) \]

Where:
- $ I $ is the interest.
- $ P $ is the principal amount (the initial sum of money).
- $ R $ is the annual interest rate (in decimal form).
- $ T $ is the time the money is invested or borrowed for, in years.
- $ A $ is the total amount (principal + interest).

### Example:
If you invest $1,000 at an annual interest rate of 5% for 3 years, let's calculate both the interest earned and the total amount:

1. **Interest Only:**
\[ I = 1000 \times 0.05 \times 3 = 150 \]

2. **Total Amount:**
\[ A = 1000 + 150 = 1150 \]

So, the interest earned over 3 years is $150, and the total amount after 3 years is $1,150.

Would you like more details or have any questions?

### Related Questions:
1. How does simple interest compare to compound interest in terms of growth over time?
2. What factors should be

Explore the formulas for calculating simple interest: I = PRT (interest only) and A = P + (PRT) (total amount). Learn how to compute interest and total amount based on principal, interest rate, and time invested. Suitable for high school students studying basic financial mathematics.

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