Can we sell goods at no profit/no loss under gst?

Dear All,

This  question may seem rubbish. but is there any implication in GST Rules regarding selling at no profit/no loss?

Suppose I bough Product A for Rs.100/-  (incl of all taxes)

1)Can i sell it at Rs.100/- with out considering the profit margin (no quality loss)

2)Can i sell the same product at less than Cost price?(if product has become outdated)

Can any one have your views.