Yoko's and Yen's savings were in the ratio of 4 : 9. Both of them shared the cost of their younger sister's present equally. Yoko's remaining savings was ¹₅ as much as Yen's savings. What percentage of her savings did Yen spend? Correct the answer to 1 decimal place.

	Yoko	Yen	Difference
Before	4x4 = 16 u	9x4 = 36 u	5x4 = 20 u
Change	- 11 u	- 11 u
After	1x5 = 5 u	5x5 = 25 u	4x5 = 20 u

Since Yoko and Yen shared the cost of their younger sister's present equally, the amount each paid for the present is the same. 

So, the difference in the amounts between Yoko and Yen at first and in the end remains the same.  Make the difference in the amounts between Yoko and Yen at first and in the end the same. LCM of 5 and 4 is 20.

Amount that Yen spent on the present
= 36 u - 25 u
= 11 u

Percentage of her savings that Yen spent
= ¹¹₃₆ x 100%
≈ 30.6%

Answer(s): 30.6%