Coles has cut the price of Cadbury's chocolate bars by 20%. Their normal price is $3.45. A shareholder who has a Coles-Myer discount card is also entitled to a further discount of 7.5%. What would a shareholder save on the normal price?

The first discounted price is given through the equation,

discounted price = ($3.45) (1 - 0.20) = $2.76

Then, due to the privilege of being a Coles-Myer discount card holder, another 7.5% discount is given. Such that the final price would be,

final price = ($2.76) (1 - 0.075) = $2.553

The total amount saved up is equal to,

$3.45 - $2.553 = $0.897