问一个英文百分比的表达

题目

问一个英文百分比的表达
A week ago,the Federal Reserve cut the key interest rate by 3 quarters of 1% down to 3.5%.
这个3 quarters of 1%

答案

0.75%,具体算法是3/4*1%
一个月以前,联邦储备把主要利率减了0.75%,降低到3.5%