A logistics company has been in business for 4 years and wants to develop monthly indices. Monthly inventory quantities for these years are shown in the table below.
a) Develop monthly indices.
b) Estimate next year’s forecast for the months April, July, and December, assuming that the annual inventory quantity will be 1,500 units.

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MONTH Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec Inventory Quantities (thousands of units) YEAR 1 YEAR 2 YEAR 3 YEAR 4 82 82 82 70 78 84 85 90 82 91 90 90 90 90 123 89 100 89 86 80 75 78 120 99 103 92 84 83 82 99 78 93 120 78 99 100 82 89 77 88 119 99 89 100 86 84 80 82