A greengrocer sold exactly 1600 kg of
vegetables in a week.
40% of this mass was onions. This percentage
is correct to 1 s.f.
a) What is the upper bound for the mass of
onions sold in this week?
b) What is the difference between the upper
bound and the lower bound of the mass of
onions sold in this week?
Give your answers in kilograms (kg).