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A rectangular tank of height 2.5 m has a base measuring 1.5 m by 2.0 m. This tank was full of water. After a day’s use, the level of water fell to 2.1 m. How many litres of water were used? (1#m^3#= 1000litres)
A. 1200
B. 6300
C. 7500
D. 1200000