90% of Min's amount was $3102 more than Perry's amount. When Min spent 65% of her amount and Perry spent 35% of his amount, they had the same amount of amount left. Find the amount that Perry had at first.

	90% of Min's amount	Min's amount	Perry's amount
Before	234 u	260 u	140 u
Change		- 169 u (- 65%)	- 49 u (- 35%)
After		91 u	91 u

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

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

35% = ³⁵₁₀₀ = ⁷₂₀
65% = ⁶⁵₁₀₀ = ¹³₂₀

The amounts of amount that Min and Perry had left were the same.
Make the numerators the same.

⁷₂₀ of Min's amount = ¹³₂₀ of Perry's amount
⁹¹₂₆₀ of Min's amount = ⁹¹₁₄₀ of Perry's amount

Amount that Min had = 260 u

90% of the amount that Min had
= 260 u x 90%
= 260 u x ⁹⁰₁₀₀
= 234 u

Difference between 90% of Min's amount and Perry's amount
= 234 u - 140 u 
= 94 u

94 u = 3102
1 u = 3102 ÷ 94 = 33

Amount that Perry had at first
= 140 u
= 140 x 33
= $4620

Answer(s): $4620