Check Your Storage Utilization – Amazon Cannot Do Simple Math!

This is what Amazon “Seller Support” tells me about my use of space in one of their warehouses:
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“On checking the “Open shipment” there is 2.66 cubic feet was used for 48 units for the receipt by Amazon based on the dimensions 1.8 x 1.8 x 8.5 inches.
Also we checked the “On-hand” there is 7.98 cubic feet was used for 144 units.
Hence the sum of “Open shipment” and “On-hand” cubic feet is : 2.66 + 7.98 = 10.64 cubic feet which is the current usage.”
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But they just can’t do simple math!
1.8″ x 1.8″ x 8.5″ = 27.54 cu inches = 0.0159375 cubic feet
48 units would be 0.765 cubic feet
144 units would be 2.295 cubic feet
The total would be 3.06 cubic feet.

Now this does not matter now, but they have to get the math right before spring when they will get a lot more product, and they might charge me for “excess storage” unfairly.