
Answer:
So, the relevant cash flows are Revenue, materials and labour cost.
Explanation:
A relevant cashflow is that which is future cash cost/revenue which arises as a direct consequence of a decision. For a cost or revenue to be considered a relevant cashflow it must satisfy the following conditions:
1) Futuristic 2).Cash based  3)Incremental
Relevant cash flows for the contracts are set down below:
                       $              $
Revenue             200,000         260,000
Materials             (10,000)         (10,000)
Labor               (88,000)         (120,000)
Net cash flow          102,000         130,000     Â
Depreciation is not a cash item, the consulting advice fee is already a sunk cost. Apportioned overhead is also not a direct cost but sunk
So, the relevant cash flows are Revenue, materials, labour