Reading 47 Practice Problems 1 & 2 AARGH!!! following, currency, convert, instead, direct

TheMBAGlover

To calculate currency contribution why can’t we simply do this -:
Beginning Exchange Rate = R1
Ending Exchange Rate = R2
Currency Contribution = (R2-R1) / R1
Using this more direct approach I get the following as currency contributions in Practice Problems 1 and 2.
1. 0.6/6 = 10% (book says 13%)
2. Yen 5/100 = 5% (book says 5.24%)
Euro .0204/1 = 2.04% (matches text)
What am I doing wrong. Even if I convert the currencies to direct rates instead of indirect I get a discrepancy with the text. AAARGHHHH!!!!