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

$2024202320222021$ Sales$ $340,000$$ $400,000$$ $420,000$$ $500,000$ Gross profit $180,000240,000340,000400,000$Net income $70,00090,00040,00050,000$

Could you help Don with the request?

Note: Round your answers$$to the nearest whole percent.