Return on Assets

The following information was taken from recent Apple Inc. financial statements. Numbers are in millions.

a$.$ What was Apple's return on assets for each year?

Note: Round answers to one decimal place $($ex: $12\mathrm{.}3\%).$

b$.$ Based on your answer from part a$.,$ how did the company's performance change from year to

year?

The company's performance

from $2020$ to $2019.$