A cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.1 m and its walls are 5 cm thick. The thickness of the bottom is__________?
A. 90 cm
B. 1 dm
C. 1 m
D. 1.1 cm
A. 90 cm
B. 1 dm
C. 1 m
D. 1.1 cm