The financial statements of Apple Inc. are presented in Appendix A$.$ The complete annual report, including the notes to the financial statements, is available at the company's website.

Click here to view Appendix A$.$

Answer the following questions.

$($a$1)$

Determine the percentage change for short$-$term marketable securities from $2018$ to $2019.($Round answer to $1$ decimal place, eg $15\mathrm{.}2.)$

Short$-$term marketable securities $\%$