The price for the items ordered at lunch was $23.45.Now, let's find how much would the price be after you tip 20%?Important data:=> 23.45 dollars = total amount that was billed to your ordered items.=> 20% (20% /100% =.20) = the tip the you will be giving base on the amount you were charged for the items you bought.Now, since I already converted the 20% to decimal, let's start solving.=> 23.45 * . 20 = 4.69 dollarsNow, let's add=> 23.45 + 4.69 = 28.14 dollars