Gen Z Limited signed a contract on the $28$th of February $2020,$ with Wahoo Limited $($the customer$),$ to install a generator at their new offices in New Germany, the terms of which included the following:

Gen Z Limited agreed to supply and install the generator before the $30$th of June $2020$

Wahoo Limited agreed to pay R$150000,$ in advance on the $31$st of March $2020.$

Gen Z Limited installed the generator on the $17$th of June $2020$ on which date, the customer obtained control. Wahoo Limited paid the promised consideration on the $31$st of May $2020.$

REQUIRED:

Prepare the journal entries in Gen Z Limited if: $(10)$

a$)$ Contract is non$-$cancellable

b$)$ Contract is cancellable in the event of non$-$performance