is this a good formula for shared hosting

[Deping]

hey i have worked out this formula to work out how much i can sell my server for so here it is
GBx4=BW
and the prices
GB=price+.50
so a 5GB plan would have 20GB of bandwidth and it will cost $5.50 Per month

and a 10 GB plan would have 40GB of bandwidth and cost 10.50 per month

are these ok prices ?
and i will have good support and the servers will not be over sold