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

	Shiyun	Wendy	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 Shiyun and Wendy shared the cost of their older sister's present equally, the amount each paid for the present is the same. 

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

Amount that Shiyun spent on the present
= 8 u - 5 u
= 3 u

Percentage of her savings that Shiyun spent
= ³₈ x 100%
≈ 37.5%

Answer(s): 37.5%