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Page Tables Question

Hello to all of you and huge thanks for keeping this forum up so we can ask questions.

I'm currently reading for Operational Systems and i have the following question, which i'm not sure i've found the right answer.

So here we go :

A 32bit Machine uses paging with a page size of 4KB. Each data entry at the page table has 8 Bytes size.
A process has
Code Size : 653789 Bytes
Stack Size : 23934 Bytes
Data Size : 178934 Bytes

How much memory must be provided for the page table if :
a) it is a one level page table
b) it's a 2 level page table, where the first 10bits are used to adress the page table of the highest level (level 1).

Now i think i've found some stuff, but i'm not quite sure.

For a),since the page size is 4KB (2^12), i need to multiply the data entry size with 1024.

But for b :
First i convert the Code,Stack and Data sizes to powers of 2.
So
Code Size = 653,789/1024 = 638,4 = 639KB
Stack Size = 23.3 = 24 KBytes
Data Size = 174,7 = 175 Kbytes

But then i'm not sure of what to do.
Can anyone help please?
(sorry if i used wrong words/terms anywhere. English is not my first language!)

Thanks for reading!