KINGSTON, Jamaica — Motorists should see an increase at the pumps in the price of gasoline effective Thursday, May 21, according to the latest ex-refinery costs from Petrojam. 90-octane will be sold for $201.82 per litre after an increase of $4.50, while 87-octane will be sold for $194.38, up $4.50. Automotive diesel fuel will be sold for $202.00 per litre after an increase of $4.50, and ultra-low sulphur diesel will...