TOPIC: Some queries on Formula Study Guide

Hello Cornelius,

Please refer to page 8 of the Formula Study Guide wherein the Description for Cost Performance Index has been mentioned as "a ratio of actual cost to earned value". Should it not be the other way round, i.e., a ratio of earned value to actual cost?

Also, in page 2, in the formula for EAC (typical), it has been mentioned that
EAC = AC + ((BAC-EV)/CPI) whereas Page 185 of the PMBOK guide says that
EAC = AC + ((BAC-EV)/(CPI * SPI)). Please clarify.