(1) Statistical chart with a 360-degree circle, and the percentage of Magnolia grandiflora in the circular statistical chart.

=360 -90 - 158 -67 =45

The percentage of Magnolia grandiflora in the total number of plants = 45/360 = 0.125 =12.5%.

(2) The number of trees on American Red Road =158/360 *1440 = 632.

The number of Japanese red maple = 67/360 * 1440 = 268.

American Red Road Movement Times = 632-(632+268)/2 = 632-450 =182.

A: Then, the 182 tree should be removed from the American Red Road and planted with the same number of Japanese red maples.