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The table below shows hypothetical data for volumes of e-books and hardcover books sold over a 3-year period in a particular city.

​	E-books	Hardcover Books
Year 1	23 000	72 000
Year 2	52 000	59 000
Year 3	106 000	31 000

TABLE 2-3

Refer to Table 2-3. Suppose we choose Year 1 as the base year and construct a series of index numbers with which to analyze sales data. The index numbers for volumes of hardcover books sold (starting with Year 1) is

▸ 431; 819; 100.

▸ 100; 0.819; 0.431.

▸ 100; 81.9; 43.1.

▸ 0.431; 0.819; 100.

▸ 43.1; 81.9; 100.

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