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The table below shows hypothetical monthly cell phone plan fees for the identical service over several years.

2018	$55
2019	$50
2020	$40
2021	$35
2022	$25

TABLE 2-2

Refer to Table 2-2. Assume that 2018 is used as the base year, with the index number = 100. The value of the index number in 2020 is

▸ 72.73.

▸ 137.5.

▸ 1.375.

▸ 100.

▸ 0.72.

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