SELECT sum(revenue) FROM manufacturers WHERE Headquarter  =  'Tokyo' OR Headquarter  =  'Taiwan'
Return the total revenue of companies with headquarters in Tokyo or Taiwan.
[Schema (values) (types)]: | manufactory_1 |  Manufacturers : code (text) , name (number) , headquarter (text) , founder (text) , revenue (text) | Products : code (text) , name (number) , price (text) , manufacturer (text);