1) 0.008^21 * 25^21 * 25^10 = (0.008*25)^21 * 25^10
2) 0.2^10 * 0.2 ^11 * 25^10 =
(0.2*25)^10 * 0.2^11
3) (5*0.2)^10 * 0.2 = 1*0.2= 0.2
