Answer: Yes
Sales Tax = 7% of the 18$, which means we should multiply 18 by 0.07:
18 × 0.07 = 1.26
Sales tax = 1.26$
Now we have to add the sales tax to the original cost of the DVD which is 18$:
18 + 1.26 = 19.26
So the total cost is 19.26$
Since she has 20$, she then has enough money.