Toyota said Wednesday that its half-year net profit soared 82.5 percent to $10.14 billion while raising its annual earnings forecast as a weak yen and improving sales in North America helped boost its bottom line. The world's biggest carmaker said it earned 1.0 trillion yen ($10.14 billion) on revenue of 12.53 trillion yen, up 14.9 percent on year. It also raised its full year to March profit forecast to 1.67 trillion yen, up from 1.48 trillion yen previously.