Question 1201581
They are not the same.  If 30% is taken off, 70% of the price remains which is $210.  The coupon is then applied, leaving 90% of the sale price to pay which is $189.  The additional 10% is taken off of a smaller value that the original price.  If a total of 40% is taken off, 60% remains, which is $180.  That is not the same as $189.