A clinic recorded 6400 new cases of gonorrhoea in 2018, and 25% of these cases were caused by bacteria resistant to penicillin. In 2019 the clinic recorded the same total number of cases, but the number of resistant cases had doubled. What percentage of the 2019 cases was caused by resistant bacteria?
12.5%
37.5%
50.0%
75.0%
176 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.