Ahome theater system is marked down from $3999 to $3180. what is the discount, and what is the rate of discount? (round to the nearest 0.1%)

819,20.48 %

Step-by-step explanation:

Initial price=3999

Final price=3180

Discount is given by

=initial price - Final price

=3999-3180=819

Rate of interest is given by

=

i.e.

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