a$.$ Calculate historic $($year$-$on$-$year$)$ sales growh for each business unit, segment, and total consolidated sales.

Note: Use negative signs with answers, when appropriate.

b$.$ Use the historic growth in Total consolidated sales $($from $2017$ to $2018)$ calculated in Part a to estimate total consolidated sales for $2019.$

Estimated total consoldated sales for $2019$

Estimated total consoldated sales for $2019$

e$.$ Which approach do we believe is more accurate in forecasting total consolidated sales?