Torrid had $20 to but a birthday present for her dad. she decided to buy a dvd for $18. the sales tax is 7%. does she have enough money? explain your reasoning. show work too

You could find the final cost of the DVD with tax by multi. $20 by 1.07:

1.07($20) = $21.40.  Unfortunately, Torrid does not have enough $ to buy this DVD.

You need to calculate 7% of $18 and add to $18.

7% of $18 =

= 7% * $18

= 0.07 * $18

= $1.26

The sales tax is $1.26

$18 + $1.26 = $19.26

Since $19.26 is less than $20, she has enough money.