First, we need to find the discounted price in November.
Discounted price = base - (base × rate)
Discounted price = 70 000 - (70 000 × .20)
Discounted price = 70 000 - 14 000
Discounted price = P 56 000 - Discounted price in November.
Then...
Discounted Price = base - (base × rate)
Discounted Price = 56 000 - (56 000 × .25)
Discounted Price = 56 000 - 14 000
Discounted Price = P 42 000 - Discounted price in December.