Calculate the final price after applying a discount percentage to an original price. Return the result rounded to 2 decimal places. If the original price or discount is negative, return null.

Examples:

Decimal originalPrice = 100.00;
Decimal discountPercent = 20;
Decimal finalPrice = calculateDiscountPrice(originalPrice, discountPercent);
// Results: 80.00
// Explanation: 20% discount on 100.00 is 20.00, so final price is 80.00

Decimal originalPrice = 49.99;
Decimal discountPercent = 15;
Decimal finalPrice = calculateDiscountPrice(originalPrice, discountPercent);
// Results: 42.49
// Explanation: 15% discount on 49.99 is 7.50, so final price is 42.49
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