R47: Says Market Allocation Effect but uses Market Allocation Contribution? 150, allocation, question, difference

Palantir

(Foreword: I've searched this topic and I know the difference between the two formulas)

In Schweser Concept Checkers question 3C, it asks to compute the market allocation effect for Portfolio G:

Market Allocation Effect (pg 150) = (wp-wb)(rb,-rb[i])

BUT: The Schweser answer instead uses the Market Allocation CONTRIBUTION, found on page 140.

Market Allocation Contribution: (wp-wb)(rb)

Can anyone please help reconcile? Am I overthinking this? I had to pull an all-nighter last night so I'm a little zonked.

Much thanks!

mp3bu

the results is same