Answer:
 There is a loss on buying from outside supplier ,Peach's offer should not be accepted.
Step-by-step explanation:
Variable cost is a cost that varies with number of units produced or sold so it is always a relevant cost while making decision. 
Fixed cost remains constant irrespective of number of units so it is a irrelevant cost unless avoidable.So in the given case ,fixed cost $70 is irrelevant since same will be incurred whether purchased or manufactured. 
 
Incremental savings 
Saving in variable cost 220 
saving in fixed cost 25 
Total saving 245 
less: Incremental cost (270) 
Incremental profit /(loss) on buying from outside supplier (25) 
Total loss 25*5900= -147500 
Therefore, There is a loss on buying from outside supplier ,Peach's offer should not be accepted.