To find the total cost of Michele's order, we need to sum the prices of the items she purchases:Deluxe Cheeseburger: $3.90Order of French Fries: $0.90Milk Shake: $2.50Now, add these amounts:3.90+0.90+2.50=7.303.90+0.90+2.50=7.30So, Michele's total cost for the meal is $7.30.If she pays with a $20.00 bill, we can find her change by subtracting the total cost from the amount she paid:Change=AmountPaid−TotalCost=20.00−7.30=12.70Change=AmountPaid−TotalCost=20.00−7.30=12.70Michele's change will be $12.70.