19 A box has a mass of 1.7 kg, correct to the nearest 0.1 kg. (a) Write down the lower bound for the mass of the box. (b) The box holds 100 jars. Each jar has a mass of 140 grams, correct to the nearest 10 grams. Calculate the lower bound of the total mass of the box and 100 jars. Give your answer in kilograms.