Answer:
see the explanation
Step-by-step explanation:
we know that
To find out the ratio between two values divide one value by the other value
Let
x ----> the amount in dollars
y ---> the time in minutes
so
[tex]ratio=\frac{x}{y}[/tex]
substitute the given values
[tex]\frac{280}{7}\ \frac{\$}{min}=\$40\ per\ minute[/tex]
therefore
The new unit is [tex]\frac{dollars}{minute}[/tex]
