(Bloomberg) -- China’s largest banks are preparing to cut interest rates on existing mortgages and deposits, the latest state-directed measures to shore up growth in the world’s second-largest economy.Most Read from BloombergCitadel Vets 69,000 Intern Applicants to Find Next Math GeniusesWhat to Do With a 45-Story Skyscraper and No TenantsPutin Agrees to Visit China in First Trip Since Arrest WarrantAuto Union Boss Wants 46% Raise, 32-Hour Work Week in ‘War’ Against Detroit CarmakersGoldman Is S