In a bag of notes, the number of $5, $50 and $100 are in ratio of 2 : 2 : 5.
12 of the $5-notes and 2 $50-notes are taken out. The remaining notes are worth $2320. Find the difference between the value of $100-notes and $5-notes in the end.
| |
$5 |
$50 |
$100 |
| Before |
2 u |
2 u |
5 u |
| Change |
- 1 u |
- 2 |
|
| After |
1 u |
2 u - 2 |
5 u |
| |
$5 |
$50 |
$100 |
Total |
| Number |
1 u |
2 u - 2 |
5 u |
|
| Value |
5 |
50 |
100 |
|
| Total value |
5 u |
100 u - 100 |
500 u |
2320 |
Total value of the notes
= 5 u + 100 u - 100 + 500 u
= 605 u - 100
605 u - 100 = 2320
605 u = 2320 + 100
605 u = 2420
1 u = 2420 ÷ 605 = 4
Difference between the value of $100-notes and $5-notes in the end
= 500 u - 5 u
= 495 u
= 495 x 4
= $1980
Answer(s): $1980
