The library has purchased 480 science and technology books and story books, of which the number of story books is twice that of science and technology books. What are these two books?

Science and technology books are

480 \ (2+1+1) =120 (Ben)

Story books include

480- 120=360 (Ben)

An electronics factory made a profit of 60,000 yuan in 1990, which increased 20 times in 2000 and 0 times in 2008. What was the profit in 2008? (column calculation)

The profit in 2000 was

6×(20+ 1)= 126 (ten thousand yuan)

The profit in 2008 is

126×10 =1260 (ten thousand yuan)

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