Total debentures issued: 8,000 debentures, each valued at rupee 100.
Interest rate: 11%. \[ \text{Total Interest} = \text{Total Value of Debentures} \times \text{Interest Rate} \] \[ \text{Total Interest} = rupee (8,000 \times 100) \times \frac{11}{100} = rupee 88,000 \]