Please answer a question about the following article about Hyderabad:

Like the rest of India, Hyderabad has a large informal economy that employs 30% of the labour force.:71 According to a survey published in 2007, it had 40–50,000 street vendors, and their numbers were increasing.:9 Among the street vendors, 84% are male and 16% female,:12 and four fifths are "stationary vendors" operating from a fixed pitch, often with their own stall.:15–16 Most are financed through personal savings; only 8% borrow from moneylenders.:19 Vendor earnings vary from ₹50 (74¢ US) to ₹800 (US$12) per day.:25 Other unorganised economic sectors include dairy, poultry farming, brick manufacturing, casual labour and domestic help. Those involved in the informal economy constitute a major portion of urban poor.:71

In 2007 how many street vendors did Hyderabad have?
40–50,000