First, calculate how much Shari paid in total for 2.5 yards of fabric. Since each yard costs $7.99, you would multiply the number of yards Shari bought by the price per yard:
7.99×2.5=19.975, which rounds to $19.98
Then, calculate how much fabric Shari actually used:
(3/4)×2.5 yds= 1.875 yards
Next, calculate how much Shari would have paid if she only bought the amount of fabric that she used (1.875 yards):
7.99×1.875=14.98125, which rounds to $14.98
Lastly, to find the amount Shari could have saved, subtract $14.98 from the amount Shari actually paid, $19.98:
19.98-14.98=5.
So, the final answer would be that Shari could have saved $5.