40% of the memberships sold by gym a were gold memberships. 25% of the memberships sold by gym b were gold memberships. which statement must be true?

if both gyms sold 80 total memberships, gym a sold 12 more gold memberships.

if both gyms sold the same number of memberships, gym a sold 15 more gold memberships.

gym a sold more gold memberships than gym b did.

if gym b sold 50 memberships, 25 would be gold memberships