In example 6, you are borrowing US$ and so the interest is 5.8% per year. However since we are borrowing for 3 months, the actual interest is 5.8 / 4 = 1.45% (or, 0.0145)
In example 7, we are depositing US$ and so the interest rate is 6.4% per year. We are only depositing for 3 months and so the actual interest will be 1.6% or 0.016.
(I am sorry but there is a typing error in the answer – it should be 1.016, not 1.0116. The rest of the numbers in the answer are correct).