Answer:
The amount of the subsidy is $6,000.
Step-by-step explanation:
Since the payment is made at the end of each calendar year and the months of usage are the months of February through September, this implies the payment was due at the end of September but dalayed for 3 months from the end of September to the end of December.
The amount of subsidy can therefore be calculated as follows:
Subsidy amount = Total utility bill * Interest rate per month * Number of months the payment is delayed = $800,000 * 0.25% * 3 = $6,000
Therefore, the amount of the subsidy is $6,000.