Consider the transportation problem and its initial solution in the table below. What is the improvement index for the empty cell Source 1 - Destination 3? 
Definitions:
Debt-Equity Ratio
This ratio compares a company's total liabilities to its shareholder equity, providing insights into its financial leverage and risk.
Total Debt Ratio
A financial ratio that measures the total amount of a company’s debt relative to its total assets, indicating the degree of leverage and financial risk.
Common-Base Year Value
An accounting method used to compare financial statements of different years by translating figures into values relative to a single base year.
Accounts Receivable
Outstanding dues from customers for goods or services a company has already delivered.
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