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

	Cindy	Joelle	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 Cindy and Joelle shared the cost of their mother's present equally, the amount each paid for the present is the same. 

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

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

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

Answer(s): 30.6%