Question: What is the amount given by the Metropolitan Police Department to Cybernational?
SPARQL:
 select sum(xsd:decimal(?amount)) as ?sum from <http://linkedspending.aksw.org/dc-vendors-contractors> { ?obs qb:dataSet ls:dc-vendors-contractors. ?obs lso:dc-vendors-contractors-from <https://openspending.org/dc-vendors-contractors/from/metropolitan-police-department>. ?obs lso:dc-vendors-contractors-to <https://openspending.org/dc-vendors-contractors/to/cybernational-inc>. ?obs lso:dc-vendors-contractors-amount ?amount. }