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