Google’s parent company Alphabet benefited from a strong online advertising business in the past quarter. Revenue rose by 15% year-on-year to $80.5 billion, Alphabet announced after the close of trading on Thursday. Analysts had expected an average of only around $79 billion. Profit rose to $23.66 billion from just over $15 billion a year earlier. The share price jumped by more than 12% at times in after-hours trading. Alphabet announced a dividend of $0.20 per share for the first time – and also held out the prospect of further dividend distributions in the future. Google’s advertising revenu…