Final answer:
The Middleton clinic's assets grew by $75,000 in 2015 and this growth was financed by an increase in equity.
Step-by-step explanation:
The Middleton clinic's dollar growth in assets during 2015 was $75,000. This can be calculated by subtracting the total assets at the end of 2014 ($500,000) from the total assets at the end of 2015 ($575,000).
The growth in assets was financed by an increase in equity. The equity balance at the end of 2014 was $350,000, and it increased to $380,000 at the end of 2015. Therefore, the clinic's equity increased by $30,000 in 2015, which was used to finance the growth in assets.