The 30% discount refers to 30% of 49 less. So, let's find 30% of 49.
[tex]0.30\cdot49=14.7[/tex]The discount is $14.7. To find the final price, we subtract
[tex]49-14.7=34.30[/tex]The final price, after the discount, is $34.30.
PART B.20% tip on an $8 sandwich means we have to find 20% of 8.
[tex]0.20\cdot8=1.6[/tex]The tip is $1.6.
PART C.First, we find the 20% of 112.75.
[tex]0.20\cdot112.75=22.55[/tex]Then, we add the tip to the cost.
[tex]112.75+22.55=135.30[/tex]The final price is $135.30.
PART D.First, we find 45% of 15.
[tex]0.45\cdot15=6.75[/tex]Then, we subtract the discount from the price
[tex]15-6.75=8.25[/tex]The price paid was $8.25.