It depends. I always sell at a profit, but I'd sell the highest one that is profitable first, thereby lowering my share price average. That would hopefully mean a higher profit long term.
Depends on if you want a profit or a loss. If you need a loss to offset some profits, it may make sense to sell the .05's at a loss. Also, keeping the .02's you will probably always be in the money.
If you have had the shares a year or more, they will be taxed as long term capital gains. 20%. Less than a year, like regular income, which is probably taxed higher.