Hi Marylampsg

There could be a typo in the question for part b. In the beginning of the sentence, it says that there is a 20% discount given for the necklace. And the final question  is asking yet again for the percentage discount for the necklace. 

I may be wrong but part b might not have an answer due to this typo.

$143.50-$3.50=$140

$140/2=$70(a)