In the past, it took 8 hours for Letong toy factory to produce 1200 dolls. After the technological innovation, it took only 6 hours to complete the production. What percentage of the working time has been shortened? How much has the work efficiency been improved? (one decimal place before the percent sign)

(8-6) △ 8, = 2 △ 8, = 25%; 1200 △ 8 = 150 (pieces); 1200 △ 6 = 200 (pieces); (200-150) △ 150, = 50 △ 150, ≈ 33.3%; answer: the working time is shortened by 25%, and the working efficiency is improved by 33.3%

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