 , the city's gross domestic product (GDP) by purchasing power parity (PPP) was estimated at $78 billion with a projected average growth rate of 5.5 percent.The city accounts about half of the total collections of the Federal Board of Revenue, out of which, approximately half are customs duty and sales tax on imports.Karachi produces about 30 percent of value added in large-scale manufacturing, 20% of the GDP, the World Bank identified Karachi as the most business-friendly city in Pakistan.