Assuming the same rate of change continues for the following data:

Year (x)	2019	2020	2021	2022	2023
Profit(in Percentage) (y)	38	40	65	72	69

The equation of the straight line trend using the least square method is:

The equation needs to be in the form $y = mx + c$ where $m$ is the slope and $c$ is the y-intercept.

Given that the slope is $9.4$, we need to find the y-intercept $c$.

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Year (x)	Profit (y)
2019	38
2020	40
2021	65
2022	72
2023	69

Number of data points: $n = 5$

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The least squares line passes through the point $(\bar{x}, \bar{y})$.

$\bar{x} = \dfrac{2019 + 2020 + 2021 + 2022 + 2023}{5}$

$\bar{x} = \dfrac{10115}{5}$

$\bar{x} = 2021$

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$\bar{y} = \dfrac{38 + 40 + 65 + 72 + 69}{5}$

$\bar{y} = \dfrac{284}{5}$

$\bar{y} = 56.8$

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Using the formula $c = \bar{y} - m \times \bar{x}$:

$c = 56.8 - 9.4 \times 2021$

$c = 56.8 - 18997.4$

$c = -18940.6$

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The equation of the straight line trend is:

$y = 9.4x - 18940.6$