Answer:
The answer is 3 more party favors
Step-by-step explanation:
30/2=15 = her friends that make it
her mom bought 40% and 15 of her friends make 50 percent
she need 50%
so.. 1 person is 4% and 3% that means 40 + 3 + 4 + 3 = 50
or use a grade calculator lol