The following table shows the amount spent, in billions of dollars, on recreational boats and accessories in the United States during the period 1999-2001. (Let S be the set of all dollars represented in the table.)Compute the cardinality of the set described as 
.
Used Boats, UNew Boats, NAccessories, RTotal1999, A752142000, B77.5317.52001, C69419Total2021.5950.5?
A. 6
B. 21.5
C. 19
D. 5
E. 9
Answer: E
Mathematics
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