which is the most accurate way to estimate 24% of 86

Question

1/2 X 84

2/3 X 84

1/4 X 84

3/4 X 84

Answer 1

24% is almost 25% = 25/100 = 1/4

1/4 of 84 = 21 is the best estimate, but it's slightly over so, maybe you'd just subtract 1 and estimate 24% of 84 is 20

actual percentage, 24% x 84 = 20.16