Check whether a 10-digit Indian mobile number matches the correct format, and format it with the +91 country code.
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Convert a rupee amount into words (lakh, crore).
Mask an Aadhaar number to show only the last 4 digits.
Add or remove GST from an amount, with category-based rates and a CGST/SGST/IGST split.
Check whether a GSTIN matches the standard 15-character format and extract its PAN and state code.
Calculate loan EMI for flat or reducing-balance interest with amortization charts.