Okay so I did the math for my product and this is how it turns out.
Keep in mind that I do not have tax where I live so I do not need to include it.

APROX 15 treats is 1/2lb 3.16
45 treats is 1 lb 6.76
63 treats is 1 1/2lb 8.92
97 treats is 2lbs 13.00

Should I round them to
3.25
6.75
9.00
13.00

or
3.50
7.00
9.00
13.00

I am not sure which direction i should do with this, i want the numbers to seem solid and good but apeal to the customer so please help thanks!!!