user: Question: What is the sum of people per km2 for the sandoy region with an area of 112.1?
Columns: ['Name', 'Area', 'Inhabitants', 'People per km²', 'Main places', 'Regions']
Types: ['text', 'real', 'real', 'real', 'text', 'text']
Sample row: ['Streymoy', 373.5, 21717.0, 57.4, 'Tórshavn and Vestmanna', 'Tórshavn and rest of Streymoy']
SQL:

assistant: SELECT SUM("People per km²") FROM "Table" WHERE "Regions" = 'sandoy' AND "Area" = 112.1;