80% of Tammy's amount was $1628 more than Glen's amount. When Tammy spent 65% of her amount and Glen spent 10% of his amount, they had the same amount of amount left. Find the amount that Glen had at first.

	80% of Tammy's amount	Tammy's amount	Glen's amount
Before	144 u	180 u	70 u
Change		- 117 u (- 65%)	- 7 u (- 10%)
After		63 u	63 u

Percentage of Tammy's amount left
= 100% - 65%
= 35%

Percentage of Glen's amount left
= 100% - 10%
= 90%

35% = ³⁵₁₀₀ = ⁷₂₀
90% = ⁹⁰₁₀₀ = ⁹₁₀

The amounts of amount that Tammy and Glen had left were the same.
Make the numerators the same.

⁷₂₀ of Tammy's amount = ⁹₁₀ of Glen's amount
⁶³₁₈₀ of Tammy's amount = ⁶³₇₀ of Glen's amount

Amount that Tammy had = 180 u

80% of the amount that Tammy had
= 180 u x 80%
= 180 u x ⁸⁰₁₀₀
= 144 u

Difference between 80% of Tammy's amount and Glen's amount
= 144 u - 70 u 
= 74 u

74 u = 1628
1 u = 1628 ÷ 74 = 22

Amount that Glen had at first
= 70 u
= 70 x 22
= $1540

Answer(s): $1540