Respuesta :

cartss

0.39799476 or 0.40

break it down into smaller pieces.

0.4000 x 0.8000

0.0800 x 0.0100

0.0090 x 0.0020

0.0009 x 0.0004

once you have your answers, just add.  (0.39799476)

however, you should simplify, which turns it into 0.40. ^^