Lacy is on a school field trip and wants to purchase a souvenir for her parents. The item she wants is priced at $20. The total cost of the souvenir with tax is $21.45. What tax rate does Lacy pay for the souvenir?

7.25%

Step-by-step explanation:

The item she wants is priced at $20.

The total cost of the souvenir with tax is $21.45.

find:

What tax rate does Lacy pay for the souvenir?

$21.45  = tax ($20) + $20

tax = ( $21.45 - $20 )

                 $20

tax = 0.725 x 100 = 7.25%

therefore, the tax of the souvenir is 7.25%

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6