70% of the mini cupcakes in Packet Q were blueberry mini cupcakes and the rest were cherry mini cupcakes. Packet R had 25% more blueberry mini cupcakes than Packet Q and four times as many mini cupcakes than the total number of mini cupcakes in Packet Q. Find the percentage of the cherry mini cupcakes in Packet R that would need to be transferred into Packet Q, so that there were an equal number of blueberry and cherry mini cupcakes in Packet Q.

	Packet Q		Packet R
	Blueberry	Cherry	Blueberry	Cherry
	10 u		40 u
Before	7 u	3 u	8.75 u	31.25 u
Change		+ 4 u		- 4 u
After	7 u	7 u	8.75 u	27.25 u

70% = ⁷⁰₁₀₀ = ⁷₁₀
100 %+ 25% = 125%

 Total number of mini cupcakes in Packet Q
= 7 u + 3 u
= 10 u

Total number of mini cupcakes in Packet R
= 4 x 10 u 
= 40 u

Number of blueberry mini cupcakes in Packet R
= 125% x 7 u
=  ¹²⁵₁₀₀ x 7 u
= 8.75 u

Number of blueberry mini cupcakes in Packet R
= 40 u - 8.75 u
= 31.25 u

Number of cherry mini cupcakes to be transferred from Packet R to Packet Q
= 7 u - 3 u
= 4 u

Percentage of mini cupcakes to be transferred from Packet R
= ⁴_31.25 x 100%
= 12.8%

Answer(s): 12.8%