Don Williams received a memo requesting that he complete a trend analysis of the following numbers using $2021$ as the base year.

$2024202320222021$

Sales $ $390,400$ $ $463,600$ $ $488,000$ $ $610,000$

Gross profit $209,100285,600413,100510,000$

Net income $42,16054,56023,56031,000$

Could you help Don with the request?