Reading 42 Market Allocation question question, different, allocation

therecruit

Im seeing 2 different ways of calculating this but I think both will get the same answer and I’m hoping someone can confirm this for me.
Looking at pg 205  reading 42 market allocation is calculated as market over/under weight * rate of return of specific market allocation
but on pg 213 it is calculated as market over/under weight * (rate of return of specific market allocation - total rate of return)
I believe either will work but not seeing well defined formula…hopfully my expalation is not too confusion but its from example 4 and example 6 of reading 42.