Risa's and Kylie's savings were in the ratio of 2 : 7. Both of them shared the cost of their older sister's gift equally. Risa's remaining savings was ¹₅ as much as Kylie's savings. What percentage of her savings did Kylie spend? Correct the answer to 1 decimal place.

	Risa	Kylie	Difference
Before	2x4 = 8 u	7x4 = 28 u	5x4 = 20 u
Change	- 3 u	- 3 u
After	1x5 = 5 u	5x5 = 25 u	4x5 = 20 u

Since Risa and Kylie shared the cost of their older sister's gift equally, the amount each paid for the gift is the same. 

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

Amount that Kylie spent on the gift
= 28 u - 25 u
= 3 u

Percentage of her savings that Kylie spent
= ³₂₈ x 100%
≈ 10.7%

Answer(s): 10.7%