The combining example has an arithmetic slip in it
The help centre article Why should I combine delivery prints 205+72*6+8=672 in the middle of a worked example whose surrounding sentences both use 645, and whose final subtraction is 1071-645=426. The expression evaluates to 645. The mechanism and the conclusion are fine; that one printed total is wrong.
We mention it because it is the reason to run your own numbers. Our calculator reproduces 1071 and 645 from the same inputs.


