Excel Simple Interest Calculator and Summary ledger creation along with loan reconciliation setup

I need an Excel format to calculate simple interest and loan values. Also need to calculate discrepancies from existing payments.I will provide the necessary data.

Requirements:
- Simple interest calculations
- Monthly input for interest calculation
- Include fields for:
- Principal amount
- Interest rate
- Time period
- Turnaround 24-48 hours

Ideal Skills and Experience:
- Proficiency in Excel
- Experience with financial calculations
- Attention to detail