Using Half-Round-Even rounding in the bill amounts as this is what python round uses.

When the bill amounts were Odd number + .5, payment could not be received as javascript rounded it up, but python rounded it down.
We are now using the python rounding (Half Round Even / Banker's Rounding) in the bill service.

bookie/src/app/shared/math.service.ts

@@ -5,7 +5,6 @@ import { evaluate, round } from 'mathjs';
   providedIn: 'root',
 })
 export class MathService {
-  // eslint-disable-next-line class-methods-use-this
   parseAmount(amount: string = '', rounding: number = 2): number {
     const cleaned = `${amount}`.replace(new RegExp('(₹[s]*)|(,)|(s)', 'g'), '');
     if (cleaned === '') {
@@ -13,4 +12,15 @@ export class MathService {
     }
     return round(evaluate(cleaned), rounding);
   }
+
+  halfRoundEven(x: number, n = 0): number {
+    const fraction = Math.round(x * Math.pow(10, n + 8)) % Math.pow(10, 8);
+    if (fraction > 50000000 - 1 && fraction < 50000000 + 1) {
+      // To compensate for floating point rounding errors
+      const floor = Math.floor(x * Math.pow(10, n));
+      return floor % 2 === 0 ? floor / Math.pow(10, n) : (floor + 1) / Math.pow(10, n);
+    } else {
+      return round(x, n);
+    }
+  }
 }