China’s economy is officially growing at a brisk clip of 7 percent, but many locally based executives at multinationals say they wouldn’t know it from the performance of their businesses. By China’s standards 7 percent is already the weakest annual growth in 25 years, but on the ground the slowdown in the world’s second-biggest economy is being felt more acutely in many sectors, even those driven by consumer spending, which government data says is growing around 10 percent.