Its not semantics at all.
I told you above, its 54% of the regular saver interest and 46% of the alternate, which is because the regular saver starts the day you pay in, that amount sits there for 12 months, the next payment 11 months etc.
The alternate account has 11/12ths for 1 month, 10/12ths the next month etc
So you can setup an equation, 54/100a% + 46/100b% x full capital amount = interest from regular savers.
annual account or bond etc is a% x full capital amount.
Your confusing yourself by halving the rate, its sensible logic to calculate the interest, but its the interest for the full amount for that account only.
Here you go, £100 invested in bond at 5% or regular at 7%
Month | Invest | Bond @5% | Regular @7% |
1 | 100 | 0.4 | 0.6 |
2 | 100 | 0.8 | 1.2 |
3 | 100 | 1.3 | 1.8 |
4 | 100 | 1.7 | 2.3 |
5 | 100 | 2.1 | 2.9 |
6 | 100 | 2.5 | 3.5 |
7 | 100 | 2.9 | 4.1 |
8 | 100 | 3.3 | 4.7 |
9 | 100 | 3.8 | 5.3 |
10 | 100 | 4.2 | 5.8 |
11 | 100 | 4.6 | 6.4 |
12 | 100 | 5.0 | 7.0 |
Year interest | . | 32.5 | 45.5 |
Or £1200 being available at the start invested in regular at 7%, bond at 5% and instant access at 4% (should be able to beat 4% but using for comparison sake)
(Bond total interest £60, savings accounts total interest £67.44
Invest | Bond @ 5% | Regular at 7% | Instant at 4% |
1200 | 60 | 45.36 | 22.08 |