Abott simplified an expression. His work is shown below.



9.5 divided by 0.25 + 4 (0.25 + 0.5) + 6


Step 1 9.5 divided by 0.25 + 4 (0.75) + 6


Step 2 38 + 10 (0.75)


Step 3 38 + 7.5


Step 4 45.5



In which step did Abott make his first mistake?


step 1


step 2


step 3


step 4