Question: For which account type of whiteacre was spent the most?
SPARQL:
 select ?result from <http://linkedspending.aksw.org/city-of-whiteacre-spending> { ?obs qb:dataSet ls:city-of-whiteacre-spending. ?obs lso:city-of-whiteacre-spending-accounttype ?result. ?obs lso:city-of-whiteacre-spending-amount ?amount. } order by desc(sum(xsd:decimal(?amount))) limit 1