Solution: let the annual growth rate be X.

30%( 1+x)( 1+x)=60%

( 1+x)( 1+x)=2

1+X = 1.4 1 -。

x=0.4 1

x=4 1%

A: The annual growth rate is 465,438+0%.

The reason why we want 30% (1+x) (1+x) = 60% is because the title says that "the utilization rate will increase to 60%". Since it is "utilization rate", it is natural to use 30% (1+x) (1).

As for (1+x)( 1+x), it means that every year is equivalent to the previous year's (1+x), so the utilization rate in the second year (that is, 2007) is 30%( 1+x), and [30]