Toyota Motor Corp lifted its operating profit guidance on Wednesday in a widely expected move, as a weaker yen increases the value of sales overseas and makes up for slumping demand at home. The yen’s decline has been a boon for Toyota, which exports roughly half of its vehicles produced in Japan. The revised guidance puts Toyota’s operating profit margin forecast at 10.0 percent from 9.4 percent based on the previous projection. For October-December, Toyota said operating profit grew 27 percent to 762.88 billion yen, versus the 690.21 billion yen estimate of 15 analysts.