Sue owes an amount of £800 Each month, she pays back 20% of the amount she still owes.
How much will she still have left to pay at the end of five months?

She will have £262 left to pay at the end of five months.

Step-by-step explanation:

Exponential equation for an amount:

A exponential equation for an amount that decays has the following format:

In which A(0) is the initial amount, r is the decay rate, as a decimal, and t is the time measure.

Sue owes an amount of £800

This means that

Each month, she pays back 20% of the amount she still owes.

This means that

So

How much will she still have left to pay at the end of five months?

This is A(5). So

She will have £262 left to pay at the end of five months.