Find the area of the kite

In trapezoid bath, ah=19.7 and et=16.1. identify be.

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Find the value of x. give reasons to justify your solutions! l, m ∈ kn