Monthly usage data for pallets used in a distribution center are as follows:

Month	1	2	3	4
January	1937	1815	1413	1809
February	1886	1938	1516	1526
March	1645	1494	1763	1807
April	2464	1954	2344	2455
May	2332	2720	2858	2480
June	2236	2215	2203	2129
July	2061	2140	2908	2815
August	2206	2589	2549	2018
September	2683	1918	2086	2771
October	2085	2015	2921	2309
November	2949	2327	2670	2281
December	1904	2813	2873	2860

a. Calculate the monthly usage index for each month. (Do not round intermediate calculations. Round your answers to 3 decimal places.)

b. Use simple linear regression to forecast total usage of pallets. (Do not round intermediate calculations. Round your answer to 3 decimal places.)

c. Forecast the seasonally adjusted usage for pallets for each month in year 5. (Do not round intermediate calculations. Round your answers to 3 decimal places.)