Price Calculator

You are calculating the final price for a product after discount and tax. The discount is applied first, and tax is calculated on the discounted price.

1. `calculateDiscount(price, discountPercent)` should return the discount amount.
2. `calculateTax(priceAfterDiscount, taxPercent)` should return the tax amount.
3. `calculateFinalPrice(price, discountPercent, taxPercent)` should subtract the discount, add tax, and return the final price.
4. `createPriceSummary(price, discountPercent, taxPercent)` should return an object with `price`, `discount`, `tax`, and `finalPrice`.