# Javascript Program to Enter the P, T, R, and Calculate it's Simple Interest

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__Javascript__ program to enter the P, T, R, and calculate its Simple Interest.

In this article, you will learn how to find the Simple Interest through P, T, and R in javascript language.

### Example

**Simple Interest = 21.6**

You should have the knowledge of the following topics in javascript to understand this program.

- JavaScript variables
- document.write

### Simple Interest Formula

`SI = (P * T * R) / 100`

### Where

**P = Principal Amount**

**T = Time**

**R = Rate**

**SI = Simple Interest**

Source Code

```
<!-- Javascript Program to Enter the P, T, R, and Calculate it's Simple Interest -->
<script type="text/javascript">
var p, t, r, SI;
// p = principal
// t = time
// r = rate
// SI = simple interest
// Calculate simple interest
p = 15;
t = 12;
r = 12;
SI = (p * t * r) / 100;
// Output
document.write("Simple Interest = " + SI);
</script>
```

### Output

`Simple Interest = 21.6`

### Explanation

In this given program, we have pre-assigned the values of **Principle**, **Time**, and **Rate** the following

, **15**

, and **12**

then we applied the interest calculation formula to these given values.**12**

Then, It will return the simple interest value of

the final output of this program.**21.6**