We have to calculate the cost of desalinated water per liter when the cost of desalinated water per acre-foot is $ 2100.

We can **solve** this problem **through dimensional analysis** by **using these conversion factors.**

1 acre = 4840 yd^{2}

1 yd = 3 ft

In the United States, water used for irrigation is measured in acre-feet. An acre-foot of water covers an acre to a depth of exactly 1 ft. An acre is 4840 yd^{2}. An acre-foot is enough water to supply two typical households for 1.00 yr.

If desalinated water costs $ 2100 per acre-foot, how much does desalinated water cost per liter?

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