A delegation of World Bank, visited the Punjab Revenue Authority (PRA) on Tuesday, appreciated the working and assured to extend any sort of technical assistance for improvement in the working and tax collection system. Sources in the Authority said that the delegation had a briefing from the PRA Chairperson Iftikhar Qutab who told them that the Authority during last three months with a handful of staff had collected over Rs 13 billion under the head of sales tax on services.