80% of Irene's amount was $172 more than Jenson's amount. When Irene spent 60% of her amount and Jenson spent 25% of his amount, they had the same amount of amount left. Find the amount that Jenson had at first.

	80% of Irene's amount	Irene's amount	Jenson's amount
Before	12 u	15 u	8 u
Change		- 9 u (- 60%)	- 2 u (- 25%)
After		6 u	6 u

Percentage of Irene's amount left
= 100% - 60%
= 40%

Percentage of Jenson's amount left
= 100% - 25%
= 75%

40% = ⁴⁰₁₀₀ = ²₅
75% = ⁷⁵₁₀₀ = ³₄

The amounts of amount that Irene and Jenson had left were the same.
Make the numerators the same.

²₅ of Irene's amount = ³₄ of Jenson's amount
⁶₁₅ of Irene's amount = ⁶₈ of Jenson's amount

Amount that Irene had = 15 u

80% of the amount that Irene had
= 15 u x 80%
= 15 u x ⁸⁰₁₀₀
= 12 u

Difference between 80% of Irene's amount and Jenson's amount
= 12 u - 8 u 
= 4 u

4 u = 172
1 u = 172 ÷ 4 = 43

Amount that Jenson had at first
= 8 u
= 8 x 43
= $344

Answer(s): $344