BxR percentage rate base fraction decimal

4. blank is the whole number from which you take portion.
5. The sale price of a book is ₱300.00. Its original price is ₱400.00 with 25% discount. 25% is blank
6. Refer to the situation in number 5, ₱300.00 blank
7. The formula in finding the percentage is blank.
8. The blank form of 25% is 0.25.
pls po help ​