80% of the mini cupcakes in Packet W were chocolate chip mini cupcakes and the rest were banana mini cupcakes. Packet X had 30% more chocolate chip mini cupcakes than Packet W and twice as many mini cupcakes than the total number of mini cupcakes in Packet W. Find the percentage of the banana mini cupcakes in Packet X that would need to be transferred into Packet W, so that there were an equal number of chocolate chip and banana mini cupcakes in Packet W.

	Packet W		Packet X
	Chocolate Chip	Banana	Chocolate Chip	Banana
	5 u		10 u
Before	4 u	1 u	5.2 u	4.8 u
Change		+ 3 u		- 3 u
After	4 u	4 u	5.2 u	1.8 u

80% = ⁸⁰₁₀₀ = ⁴₅
100 %+ 30% = 130%

 Total number of mini cupcakes in Packet W
= 4 u + 1 u
= 5 u

Total number of mini cupcakes in Packet X
= 2 x 5 u 
= 10 u

Number of chocolate chip mini cupcakes in Packet X
= 130% x 4 u
=  ¹³⁰₁₀₀ x 4 u
= 5.2 u

Number of chocolate chip mini cupcakes in Packet X
= 10 u - 5.2 u
= 4.8 u

Number of banana mini cupcakes to be transferred from Packet X to Packet W
= 4 u - 1 u
= 3 u

Percentage of mini cupcakes to be transferred from Packet X
= ³_4.8 x 100%
= 62.5%

Answer(s): 62.5%