The financial results for the four regional divisions are shown below.

North

South

East

West

Net profit

$$1,000$

$ $5,000$

$$4,000$

$ $7,500$

Assets

$2,500$

$15,000$

$8,000$

$25,000$

Liabilities

$500$

$7,000$

$1,000$

$5,000$

Total equity

$2,000$

$8,000$

$7,000$

$20,000$

Which division has the lowest return on investment?