The ratio of the number of $2-notes to $50-notes in Shiyun's bag was 1 : 5. Shiyun exchanged 6 pieces of $50-notes for $2-notes. She then had an equal number of $2-notes and $50-notes. What was the total value of $2-notes and $50-notes in Shiyun's bag at first?

	$2-notes	$50-notes
Before	1 u	5 u
Change	+ 150	- 6
After	1 u + 150	5 u - 6

Value of 6 pieces of $50-notes 
= 6 x 50
= $300

Number of $2-notes that Shiyun exchanged for
= 300 ÷ 2
= 150

After the exchange, Shiyun had an equal number of $2-notes and $50-notes.

5 u - 6 = 1 u + 150
5 u - 1 u = 150 + 6
4 u = 156

1 u = 156 ÷ 4 = 39

Number of $2-notes at first
= 1 u
= 39

Value of $2-notes at first
= 39 x 2
= $78

Number of $50-notes at first
= 5 u
= 5 x 39
= 195

Value of $50-notes at first
= 195 x 50
= $9750

Total value of $2-notes and $50-notes at first
= 78 + 9750
= $9828

Answer(s): $9828