贾斯帕（Jasper）和纳迪亚（Nadia）今年晚些时候将面临房贷还款额的大幅增加，但他们认为自己属于幸运儿。 这对夫妇在2020年底以66万澳元的价格在悉尼西南部购买了一套两居室的别墅。 他们获得了按悉尼标准或被认为是适度的贷款，以低固定利率借入52.8万 ...

Please explain “loan shark rate” in this sentence: “They were charged interest at a loan shark rate.” My comments: They had to borrow from money lenders who charge them an exorbitant interest rate.