A fairly normal cost of something in a business is 300% markup.
Example: I need a rock put in my yard.
If the rock costs $30. The first 100% equals the cost of the thing you are buying.
Then labor comes in to play so you roughly charge another 100%, now the rock is $60.
Then you need profits in order to grow the business so it goes up another 100% so the rock ends up costing you $90.
Without the profit section you are going to normally just going to break even every week after purchasing and labor.
Again it is not completely accurate but fairly close to many items being sold.
So if that phone costs roughly $450 x 3 = You are looking at close to $1,350
Example: I need a rock put in my yard.
If the rock costs $30. The first 100% equals the cost of the thing you are buying.
Then labor comes in to play so you roughly charge another 100%, now the rock is $60.
Then you need profits in order to grow the business so it goes up another 100% so the rock ends up costing you $90.
Without the profit section you are going to normally just going to break even every week after purchasing and labor.
Again it is not completely accurate but fairly close to many items being sold.
So if that phone costs roughly $450 x 3 = You are looking at close to $1,350