What percentage of the bill does DWP subsidize after a $30 deduction?

To determine what percentage of the bill DWP subsidizes after a $30 deduction, you would first need to understand how the subsidy works in relation to the total bill amount.

If we assume that the total bill is a certain amount, the DWP subsidy, after the $30 deduction, must be calculated based on the remaining balance. For example, if the initial bill amount is $100, a $30 deduction would leave a balance of $70.

If DWP subsidizes 80% of the total bill, that means they would cover $80 of the initial $100 bill. After the $30 deduction, the amount DWP would still effectively cover, relative to what remains after the deduction, aligns with this figure. Essentially, the $30 is deducted first, and then the remaining percentage is applied to the adjusted balance.

Therefore, by concluding that DWP covers the majority of the bill even after accounting for the deduction, we arrive at the understanding that 80% is correct when interpreting these calculations, which is why this option stands out as the answer.