Answer:
$450
Step-by-step explanation:
The break even point is the point where the amount you save is the same as the amount you have spent in the annual fee.
So Annual fee= $45
Save = x (amount spent) *0.1 (you save the 10% in every purchase)
then
$45=x*0.1=> x= 45/0.1= 450 U$S
I hope this was helpful. Have a nice day!