80% of Cathy's amount was $667 more than Eric's amount. When Cathy spent 65% of her amount and Eric spent 20% of his amount, they had the same amount of amount left. Find the amount that Eric had at first.

	80% of Cathy's amount	Cathy's amount	Eric's amount
Before	64 u	80 u	35 u
Change		- 52 u (- 65%)	- 7 u (- 20%)
After		28 u	28 u

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

Percentage of Eric's amount left
= 100% - 20%
= 80%

35% = ³⁵₁₀₀ = ⁷₂₀
80% = ⁸⁰₁₀₀ = ⁴₅

The amounts of amount that Cathy and Eric had left were the same.
Make the numerators the same.

⁷₂₀ of Cathy's amount = ⁴₅ of Eric's amount
²⁸₈₀ of Cathy's amount = ²⁸₃₅ of Eric's amount

Amount that Cathy had = 80 u

80% of the amount that Cathy had
= 80 u x 80%
= 80 u x ⁸⁰₁₀₀
= 64 u

Difference between 80% of Cathy's amount and Eric's amount
= 64 u - 35 u 
= 29 u

29 u = 667
1 u = 667 ÷ 29 = 23

Amount that Eric had at first
= 35 u
= 35 x 23
= $805

Answer(s): $805