I need help with

a) why are they different? Which is more reliable?

b) and c) step by step without using the excel . Thank you

1. Walgreen Company reported the following earnings per share from 1989 to 1994. ear EPS 989$1.28 990$1.42 991$1.58 992$1.78 993$1.98 994$2.30 a. Estimate the arithmetic average and geometric average growth rate in earnings per share between 1989 and 1994. Why are they different? Which is more reliable? b. Estimate the growth rate using a linear growth model. c. Estimate the growth rate using a log-linear growth model