Taxylvania has a tax code that rewards charitable giving. If a person gives $p$% of his income to charity, that person pays $(26 - 1.6 p)$ % tax on the remaining money. For example, if a person gives 10% of his income to charity, he pays 10 % tax on the remaining money. If a person gives 16.25 % of his income to charity, he pays no tax on the remaining money. A person does not receive a tax refund if he gives more than 16.25 % of his income to charity. Count Taxula earns $ 25000. What percentage of his income should he give to charity to maximize the money he has after taxes and charitable giving?

The count should give % to charity.

If the count did receive a tax refund for giving more than 16.25 % of his income to charity, how much should he give to charity?

The count should give % to charity.

NOTE: Your answers must be numbers. No arithmetic operations are allowed.