STATE OF RAJASTHAN vs RAGHUVEER SINGH & ORS.

The Supreme Court held that under the Interest Act, 1839, a claim for recovery of amounts due in a building contract constitutes a 'sum certain' as it is ascertainable based on the agreement. The Court dismissed the appellant's contention that no demand for interest was made, stating that the notices issued by the respondent sufficiently claimed interest. The High Court's enhancement of the interest rate from 4.5% to 6% was justified due to the appellant's continuous defaults.