12 A supermarket sells the three brands of rice shown in the table below. Brand
Mass of Rice
Price
A
500 g
$1.20
B
5 kg
$9.80
C
10 kg
$18.90
Raimondo wants to buy 30 kilograms of rice.
a) Which brand of rice should he buy to get the best deal, assuming that
all three brands are of the same quality?
b) How much will he save if he buys the cheapest brand of rice as compared
to the most expensive one?