A $7.50 bet recently turned a Massachusetts casino player into a jackpot winner. The bet was made on a “MegaHot 3/5/10” slot machine which turned into a $36,000 jackpot on July 25 at Encore Boston Harbor, according to the company. Encore Boston Harbor casino has more than 2,700 slot machines and more than 175 table games. Encore Boston Harbor set a new record for jackpot payouts last August, distributing more than $46.3 million to lucky winners across its gaming floor. Another record was set on New Year’s Day when a Quincy man won a life-changing jackpot at Encore Boston Harbor.