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@watchtower‌ alright so to answer your actual question, the first mistake that you are making is that we have to calculate bond equivalent yield which is based on a 365 days per yr basis. Here the rate is quoted for a bank deposit which is based on 360 days per yr.
So 1.5 × (365/360) = 1.5208%
Now calculate the add on yield for 100 days
1.5 × (100/360) = 0.4167%
Effective annual yield = 1.004167^(365/100) -1 = 1.5294%
Therefore, effective semiannual yield = 1.015294 ^ 1/2 -1 = 0.7618%
Bond equivalent yield = 0.7618% × 2 = 1.5236%
Hope this will clear the confusion. And about the curriculum change, personally I just stick to the latest 2014. So can’t help with that.