This recurring deposit calculator allows users to:

1. Input their monthly deposit amount in rupees
2. Set the annual interest rate as a percentage
3. Specify a time period in either months or years
4. Calculate and view the maturity details

The calculator provides:

• Principal amount (total deposits)
• Interest earned
• Total maturity amount

I’ve implemented the widely-used formula for calculating recurring deposit maturity: M = P × n × (1 + r/4) × (1 + (n-1)/2 × r/n)

Where:

• M = Maturity amount
• P = Monthly installment
• n = Number of months
• r = Rate of interest per annum (in decimal)

The code includes:

• Form validation to ensure users enter valid data
• Error messages for invalid inputs
• A clean, responsive interface
• Clear display of results
• Detailed comments explaining the calculation logic

I’ve significantly enhanced the recurring deposit calculator with the following improvements:

1. Added Multiple Compounding Options:
   • Yearly
   • Half-Yearly
   • Quarterly (default)
   • Monthly
2. Added Data Visualization:
   • Interactive line chart showing growth over time
   • Color-coded visualization of principal, interest, and total amount
   • Responsive chart that adjusts based on screen size
3. Improved UI/UX:
   • Tabbed interface to switch between summary and detailed views
   • Detailed monthly breakdown table
   • Better organized layout with dedicated sections
   • Added effective annual yield calculation
4. Enhanced Calculation Logic:
   • Improved algorithm that accurately calculates interest based on compounding frequency
   • Month-by-month calculation for precise results
   • Preserved the existing time period functionality (months/years)