IFRS 15

Dear Tutor,

I have question needs to be clarified. So, the question is as follows:

The entity was entered into the contract with a company operating in a developing country. There was a sudden change in the economy and entity now assumes that it will receive 70% of consideration (Assuming consideration is 1000) shown in the contract. How much revenue must be recorded?

I am asking for clarification of an issue based on IFRS 15.

Hope that I have expressed my trouble clearly.

Thank you in advance!