Backward explanation is
(30/75)(100-75)=10
I don’t understand why to do 100-75
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see the simpler explanation would be you know you completed 40% of the work as per cost then you recognise 40% of revenue therefore ans comes 40-30 = 10m
it is similar when you do (30/75)*(100-75) as 100-75 is nothing but profit and 30/75 represents the percentage of the total profit to be booked this year