So, Firstly pick out the important information, in this instance it is;
First price = $48
Discount = 30%
Coupon = 10%
So, 30% of $48
10% = $4.80
20% = 2 x $4.80 = $9.60
30% = $4.80 + $9.60 = $14.40
Plus the 10% of coupon which saves him another $4.80.
so, $48 - $14.40 = $33.60
and then
$33.60 - $4.80 = $28.80
So his final price is $28.80
BUT this is not the question, the question is how much did frank save?
so we can take
$48 - $28.80 which equals to $19.20
This means he is saving $19.20 on his sweater.
