SEOUL, South Korea (AP) — Hyundai Motor Co. said Thursday its profit sank nearly 30 percent for the July-September quarter, hurt by a stronger South Korean currency and weak sales growth in its home market. [...] sudden volatility in foreign exchange rates at the end of September raised some expenses, it said. Hyundai's share price closed 6 percent higher after the earnings release, the biggest jump since the announcement of the land purchase.