The figure below shows the nodes (A-I) and capacities (labelled on arcs in packages/day) of a shipping network. The firm would like to know how many packages per day can flow from node A to node I. 
Which nodes are the sink and source for this problem?
Definitions:
Deferred Tax Liabilities
Future tax obligations that arise due to temporary differences between the book value and tax value of assets and liabilities.
Deferred Tax Assets
Financial items on the balance sheet representing taxes paid or carried forward but not yet realized on the income statement.
Permanent Difference
A discrepancy between the tax treatment and accounting treatment of transactions and events that will not reverse in the future.
IFRS Rules
A specific set of standards and guidelines established under the IFRS framework for financial reporting and accounting.
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