year ago helped its latest third-quarter net profit jump 330% to S$99.85 million. (US$1=S$1.46). For the same period last year, SPC had a net profit of S$23.2 million after a S$71 million inventory write-down.The integrated oil company, 45% owned by another Singapore-listed company, Keppel Corp, said it expects to see healthy refining margins and strong…