50 000 000
[tex]0.2^{6}[/tex] × [tex]50^{7}[/tex]
= 6.4 × [tex]10^{-5}[/tex] × 7.8125 × [tex]10^{11}[/tex]
= (6.4 × 7.8125 ) × [tex]10^{-5+11}[/tex] = 50 × [tex]10^{6}[/tex]
= 50 000 000
0.2⁶ × 50⁷ = (0.2×50)⁶ × 50¹
... = 10⁶ × 50
... = 50,000,000
_____
If you do this in the straightforward way, you have ...
... = 0.000064 × 781,250,000,000 = 50,000,000
