I'll keep that in mind next timeYou should have used the approximations that I gave in the problem statement, not a calculator so that the final conclusion would be
but, yes, this is correct.
The reason is: If you use a calculator, then you make implicitly the assumption, that it is more precise than the values you have been given. Well, this is probably correct, as long as you didn't use a slide rule. Nevertheless, it is an assumption about a device you have no control of and you should be aware of it, e.g. if you write a protocol of an experiment.