Final answer:
By borrowing ₱150 and paying ₱80, you would still owe ₱70. This basic subtraction is a part of fundamental financial mathematics related to managing loans and debts, not considering interest, which can significantly increase the total repayment amount over time.
Step-by-step explanation:
The result of borrowing ₱150 and then paying ₱80 is that you would still owe ₱70. This calculation is straightforward: you subtract the amount paid from the amount borrowed. This scenario is a fundamental principle in mathematics, specifically in financial mathematics when dealing with loans and debt payment.
When dealing with larger sums and over longer periods, as in the referenced examples about credit card debt and loans, interest becomes a significant factor that can lead to the borrower paying much more than the initial borrowed amount. It's also essential to consider opportunity costs, as seen in the example of mental accounting, where holding onto savings with lower interest earnings than the interest costs of a debt results in a net loss over time.