penny stock trading books

Can someone explain the point system below a dollar in the stock market?
Hello,
I’m reading an ebook on penny stock trading & having trouble understanding how to understand the “points” in regards to where it stands in relation to the dollar.
For instance, here is a link to the book I bought, & a few inches down there is a pic of a graph http://www.daytradepennystocks.com/?hop=0
& it starts out at .0025, but quickly goes up to .0300 Would that first one be a quarter of a penny & the last one $3.00?
How did you mathmatically arrive at that?
Can someone explain this in common terms?
Thanks!
Good luck with daytrading those penny stocks!!
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