More than 300,000 workers in Singapore have seen their salaries shrink by over 10 per cent because of the Covid-19 pandemic, with lower income groups hit the hardest and workers aged 35-44 increasingly vulnerable to the economic fallout, according to DBS.The island nation’s largest bank revealed the data on Tuesday, after parsing anonymised March-May account data from 1.2 million customers who had their salaries credited into DBS accounts. About a third of the 300,000 affected workers saw wages…