We know that
Plugging in the values you mentioned then I get , which is the same as you so everything is right so far.
Your calculations arre correct, so it's just a case of your units and any significant figures.
Your least accurate data value is given to 1 significant figure, so your answer should be to 1 significant figure.
0.892 to 1sf is 0.9, have you tried that?
Isaac physics is always very specific with accuracy values and measurements.
If that doesn't work then it's best to check your units.
Are you sure everything is in terms of amps, m, s, etc.... i.e in base units?