Answer:
Mark paid $495 for the tablet.
Step-by-step explanation:
When on sale, Mark paid 3/4 of the original price, that is;
[tex]\frac{3}{4}[/tex] *825 = 618.75
After coupon discount, he pays 4/5 of the sale price
sale price= 618.75
He therefore pays [tex]\frac{4}{5} *618.75[/tex] = $495