Use Apple$$s financial statements in Appendix A to answer the following.

Identify the total amount of cash and cash equivalents for fiscal years ended $($a$)$ September $28,2019,$ and $($b$)$ September $29,2018.$

Compute cash and cash equivalents as a percent of total current assets, total current liabilities, total shareholders$$ equity, and total assets at fiscal year$-$end for both $2019$ and $2018.$

Compute the percent change between the beginning and ending year amounts of cash and cash equivalents for fiscal years ended $($a$)$ September $28,2019,$ and $($b$)$ September $29,2018.$ The beginning balance of cash and cash equivalents is $$20,289($millions$)$ for fiscal year $2018.$

Compute the days$$ sales uncollected as of $($a$)$ September $28,2019,$ and $($b$)$ September $29,2018.$

Does Apple$$s collection of receivables show a favorable or unfavorable change?