Why both toFixed(2) and Math.floor for productivity calculation?

[mrv777]

This productivity calculation seems to show up 3 times in the code, and I've been trying to find the error, but I can't :(

However, while trying to understand all the code, it seems to me that some steps seem redundant. Example spot of the code can be found here:
https://github.com/LiskHQ/lisk/blob/0d6c94768f212a23687fa58d8faae4782ede3b37/modules/accounts.js#L538

Now this may be for validation, but the line:
parseFloat(Math.floor(percent * 100) / 100).toFixed(2)

I would think could be written as:
Math.floor(percent * 100) / 100)
or
parseFloat((percent * 100) / 100).toFixed(2)

Not a big issue or anything, but trying to understand and help if I can :)