It’s 60 (sorry if im wrong but im pretty sure that’s correct)
Because

and

are inversely proportional, there is some constant

such that

Given that

and

, we have

So when

, you have
A negative exponent for powers of 10 represent numbers between 0 and 1.
Alright - we want to start off by seeing if this number would be positive or negative. Debit means that you owe something, or that you have to pay that amount of money. If you had money to buy things with, that would be positive, but since debit means you haven’t paid something off yet, that is negative. Next, since you have 40 dollars in debt, you have -40 dollars.
Feel free to ask further questions!
Answer:
512
Step-by-step explanation: