Add simple-interest.sh calculator script

[Copilot]

Implements a bash script to calculate simple interest from user-provided principal, rate, and time period inputs.

Implementation

• Prompts for three inputs: principal amount, interest rate (per annum), and time period (years)
• Calculates using formula: SI = (P × R × T) / 100
• Uses bc for decimal arithmetic precision (scale=2)
• Validates inputs are positive numeric values (integers or decimals)
• Exits with error for invalid inputs (negative, non-numeric, or empty values)

Usage

$ ./simple-interest.sh
Enter the principal amount:
1000
Enter the rate of interest (per annum):
5
Enter the time period (in years):
2
Principal Amount: 1000
Rate of Interest: 5%
Time Period: 2 years
Simple Interest: 100.00

Original prompt

Create simple-interest.sh bash script to compute simple interest based on user input and the input fields like principal, rate of interst and time period.

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