Inactive Tutor answered 11/01/18
Tutor
New to Wyzant
The 8 rounds the previous digit up.
But the previous digit is 9, which causes
the digit before that to round up while the 9,
in and of itself, becomes zero.
IN short, 0.081 rounds up to 0.1 and 0.9 + 0.1 = 1
The answer is 1