Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the sum of people per km2 for the sandoy region with an area of 112.1?

### Inputs:
table_name: table, columns: ['Name', 'Area', 'Inhabitants', 'People per km²', 'Main places', 'Regions']

### Response:
SELECT SUM People per km² FROM table WHERE Regions = sandoy AND Area = 112.1