A moment later, the fluorescent light above workstation 4B flickered and died, plunging Arthur into shadow. He didn't move. He just stared at the mark scheme, wondering if he had just failed a genius, or saved the integrity of the ledger.
A critical part of the AQA mark scheme—even if an initial calculation is wrong, subsequent marks can still be awarded if the method is correct based on that "own figure". Ib G Jun17 Accn2 Mark Scheme
Do not just read the mark scheme.
Marks are heavily weighted for showing the algebra and re-arrangement of accounting equations. A numerical answer alone without working gets at most 1 mark. A moment later, the fluorescent light above workstation