He bought himself fifty pence worth of trouble

He bought himself fifty pence worth of trouble he buy himself fifty pence worth of trouble这句中的worth of什么用法, fifty pence worth of trouble fifty pence worth of trouble（求高手解答） 关于新概念英语第三册15课题目：fifty pence worth of trouble very few of fifty pence pieces and pound coins worth the trouble of unrolling? he bought life ( )for himself 英语翻译好像跟价值没有关系,为什么不直接写fifty pence trouble He bought over fifty books,one of ( )was an ENGLISH-CHINESE He could not find his fifty pence anywhere nor could he get worth the trouble of doing 翻译