Rohan invested $800 in a saving account that earns 5% simple interest per ano how many interest will he earn in 3 years 

The formula for simple interest is given by:

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

Where:
- $ I $ is the interest earned,
- $ P $ is the principal (initial investment),
- $ r $ is the annual interest rate (as a decimal),
- $ t $ is the time in years.

Given:
- $ P = 800 $ dollars,
- $ r = 5\% = 0.05 $,
- $ t = 3 $ years.

Now, substitute the values into the formula:

\[
I = 800 \times 0.05 \times 3
\]
\[
I = 800 \times 0.15 = 120
\]

Rohan will earn **$120** in interest over 3 years.

Would you like further details or have any questions?

Here are 5 related questions for practice:
1. How much total amount will Rohan have after 3 years?
2. What would the interest be if the rate was 6% instead of 5%?
3. How much interest would be earned if the investment period was 5 years?
4. What would happen to the interest if the principal was doubled?
5. How does compound interest differ from simple interest?

**Tip:** Always convert percentages to decimals before using them in interest calculations by dividing by 100.

Rohan invested $800 in a saving account that earns 5% simple interest per annum. How much interest will he earn in 3 years?

Learn how to calculate simple interest on a $800 investment at a 5% annual rate for 3 years. Using the simple interest formula I = P × r × t, this problem demonstrates basic arithmetic and percentage calculations. Ideal for students in Grades 6-8.

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