Answer:
New rate must be less than or equal to 0.82 euro per dollar
Step-by-step explanation:
Less than or equal to 0.82 Euro/$ 
 
Reason: Current rate = 0.88 Euro per dollar 
 
This gives Maurice = $8000 x 0.88 = 7040 euros 
 
Profit needed = $600 
 
This means upon second conversion, Maurice must get $8000+$600 = $8600 
 
Now, let us suppose morning rate is 0.89 euro per dollar 
 
This gives 7040/0.89 = $8186 (not favorable) 
 
If morning rate is 0.82 euro per dollar 
 
This gives 7040/0.82 = $8585 (close to $8600) 
 
Thus, new rate must be less than or equal to 0.82 euro per dollar