English translation By using a new process the prime cost of the television set was reduced by 3.4 times. Why did was reduced by 3.4 times translate into "71% reduction," or 12/17? The sales of TV set have risen 3.5 fold. Why did risen 3.5 fold translate into a two - and - a - half - fold increase? I don't speak English translation, translation I understand, or 3.4 how to become 12/17? 3.5 How to become two and a half times? I don't understand that.

English translation By using a new process the prime cost of the television set was reduced by 3.4 times. Why did was reduced by 3.4 times translate into "71% reduction," or 12/17? The sales of TV set have risen 3.5 fold. Why did risen 3.5 fold translate into a two - and - a - half - fold increase? I don't speak English translation, translation I understand, or 3.4 how to become 12/17? 3.5 How to become two and a half times? I don't understand that.

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In English?

Multiple expression: A + predicate + multiple + the + n.(size / height / length... )+ As + as + abj.+ as + A + predicate + multiple + adj.comparative level + than B  A + predicate + adj.comparative level + than B + by + multiple...