When 10025 - 25 is written in decimal notation, the sum of its digits is :

Answer: Option A

100²⁵ - 25
= (10²)²⁵ - 25
= 10⁵⁰ - 25
$$=\underset{50\text{zeros}}{\underbrace{1000.....00}}-25$$     $$=\underset{48\text{times}}{\underbrace{9999.....9975}}$$
∴ Sum of digits
= (48 × 9) + 7 + 5
= 432 + 7 + 5
= 444