Find the product by suitable rearrangement:8 × 391 × 1252 × 1234 × 50

I. 8 × 391 × 125 = 391 × (125 × 8)
= 391 × 1000
= 391,000
II. 2 × 1234 × 50 =1234 × (2 × 50)
= 1234 × 100
= 123,400