1. The problem is to find the remainder when 30 is divided by 100, which is expressed as $30 \% 100$. 2. The modulo operation $a \% b$ gives the remainder when $a$ is divided by $b$. 3. Since 30 is less than 100, dividing 30 by 100 results in 0 with a remainder of 30. 4. Therefore, $30 \% 100 = 30$. Final answer: 30