OLIVIA KUMWENDA-MTAMBO and NQOBILE DLUDLA SOUTH Africa's rand dropped to a three-month low on Tuesday and local and hard currency bonds suffered as violent protests over economic hardship and inequality rippled across the country. Crowds clashed with police and ransacked or set ablaze shopping malls, with dozens of people reported killed as grievances unleashed by the jailing of ex-president Jacob Zuma boiled over into the worst violence in years. The protests rattled financial markets in the continent's most industrialised economy, with the rand dropping as much as 1.8% to 14.67 against the dollar, its lowest level since mid-April. The currency…