In a scientific investigation, a rectangular container with base dimensions 150 centimeters by 120 centimeters is used. Inside this container, four identical circular lenses and two identical square lenses are arranged on the base. The lenses are positioned in a non-overlapping manner, meaning they do not overlap each other. Each circular lens has a radius of 7 centimeters, and each square lens has a side length of 12 centimeters. What percentage of the container's base area is not covered by the lenses?