The cost of cookie is $0.85 and cost of latte is $ 3.20.
It is given that the latte required by customers is 1.
Let the cookie bought be x .
[tex]x\times0.85+1\times3.20=7.45[/tex][tex]0.85x+3.20=7.45[/tex][tex]0.85x=4.25[/tex][tex]x=5[/tex]The amount of cookie buy by the customer is 5.