Jessica found a coupon in the Sunday paper for $0.50 off each jar of Ragu spaghetti sauce if you purchase 3 or more jars. Krogers is
selling the sauce for $4.75 a jar and Jessica purchased 4 jars. What
was the final price?

I believe that the answer is $17 because since she did purchase three or more jars the coupon can be used, so minus 4.75-0.50 which gives you 4.25 and either add that together four times or multiply it by four and you get 17.
Final the final price is $17