Brazil's public debt dropped in March from the previous month as net bond redemptions offset an increase in interest payments, Treasury data showed on Monday. Public debt fell 2.34% from February to 8.633 trillion reais ($1.73 trillion), the Treasury reported. Net debt redemptions totaled 305.4 billion reais in March, while interest payments reached 98.1 billion reais. The average cost of domestic public debt issuance, measured on a rolling 12-month basis, increased to 13.92% from 13.76% in February.