Consider the market for a breakfast cereal. The cereal's price is initially $4.00 and 60 thousand boxes are demanded per week.
The company that produces the cereal is considering raising the price to $4.50. At that price, consumers would demand 55 thousand boxes of cereal per week.
What is the price elasticity of demandLOADING... between these prices using the midpoint formula LOADING...?
The price elasticity of demand using the midpoint formula is

answer; i believe that the correct answer is (d); // supercontinent

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."