About: http://webisa.webdatacommons.org/115864169

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I think another issue might be forgetting to count cost, e.g. counting the register rewards on both the trip where you got them and the trip you used them or not considering the cost of extra newspaper
http://www.w3.org/ns/prov#wasQuotedFrom	couponing101.com