Jen's and Tammy's savings were in the ratio of 4 : 9. Both of them shared the cost of their older brother's present equally. Jen's remaining savings was ²₅ as much as Tammy's savings. What percentage of her savings did Jen spend? Correct the answer to 1 decimal place.

	Jen	Tammy	Difference
Before	4x3 = 12 u	9x3 = 27 u	5x3 = 15 u
Change	- 2 u	- 2 u
After	2x5 = 10 u	5x5 = 25 u	3x5 = 15 u

Since Jen and Tammy shared the cost of their older brother's present equally, the amount each paid for the present is the same. 

So, the difference in the amounts between Jen and Tammy at first and in the end remains the same.  Make the difference in the amounts between Jen and Tammy at first and in the end the same. LCM of 5 and 3 is 15.

Amount that Jen spent on the present
= 12 u - 10 u
= 2 u

Percentage of her savings that Jen spent
= ²₁₂ x 100%
≈ 16.7%

Answer(s): 16.7%