Implemented the KPI percentage calculation function#50

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Confidence-bassey wants to merge 3 commits intodevfrom

feat/kpiPercentage

Commits on Apr 28, 2025

Implemented the KPI percentage calculation function
Confidence-bassey
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Commits on May 2, 2025

Added more helper functions for kpi percentage difference calculation
Confidence-bassey
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Commits on May 5, 2025

Added sum based percentage difference calculations
Confidence-bassey
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