One kg of sugar = $1.40 so two kg of sugar equals $1.40 + $1.40 = $2.80
One kg of salt cost $0.55, so two kg of salt costs $0.55 + $0.55 = $1.10
To find the total price, add the cost of 2kg of sugar plus 2kg of salt together.
Total price = $2.80 + $1.10
Total price = $3.90