UPDATE 1-Sinopec Q1 net up 25 pct, helped by higher gas output

7.4 pct HONG KONG/BEIJING, April 28 (Reuters) - Sinopec Corp (0386.HK The results are based on international accounting standards. If Chinese standards are used, its earnings rose 24.5 percent to 20.5 billion yuan. Sinopec's earnings were lower than the...