Question

Please help here:)

Look at the link.

http://www.csb.gc.ca/about/rates/

Answer 1

The formula Phil provides already solved everything!
My opinion is not worth to invest since:
You gain $ 150 for 60 months: $ 2,5/ monthly in compared with $100 monthly invest!
In case you double invest $200, then the interest is $5/ month which is 2.5%.

Answer 2

Definitely!

Answer 3

Yes, all Phil's calculation is precisely, no doubt! I just round it off to explain!

Answer 4

I don't know enough about this to help you. Sorry.