Which answer is correct?

Use `parseFloat((0.1 + 0.2).toFixed(2))`. `toFixed` rounds to 2 decimal places.

— quick_fix

Store prices as integers in cents (e.g., $1.50 = 150). Do all math in cents, only format to dollars for display. This avoids floating-point issues entirely.

— backend_dev

Use the `Decimal` library or `BigNumber.js` for arbitrary-precision arithmetic.

— precision_fan

Use `Math.round(x * 100) / 100` after every operation. This ensures 2-decimal precision.

— math_rounder