Multiple choice general knowledge 10 percent of 20 plus 20 percent of 10 equals 10 percent of 20 20 percent of 10 1 percent of 200 2 percent of 200 Reveal answer Fill a bubble to check yourself D Correct answer Explanation 10% of 20 = 2. 20% of 10 = 2. Sum = 4. 2% of 200 = 4. The statement '10% of 20 plus 20% of 10 equals 2% of 200' is mathematically correct.