Respuesta :

10*2=20

100 / 20 = 50

50^2 = 2500

5^2 = 25

2500 / 25 = 100

ANSWER = 100
(100÷20 (2))2 ÷ 5 2
5×2 2
10 × 10
100÷5 2
20×20
=400