Take 1.3x1.5 and i think that will give you your answer
the one that is the most cost-effective choice for buying the item would be : C. buying it a percent discount without sales tax
With this option, you can get a clear $ 10 cut which is higher compared to the other options
1) 7* 2* 3* i just know the first one sorry
I think it is c>2 , sorry if incorrect :(