During her shopping trip, Opal bought three different types of pencils, H, J and K in the ratio of 4 : 2 : 9. She decided to sell them at the prices listed as shown.
Pencil H : $2.20
Pencil J : $0.70
Pencil K : $0.50
Given that Opal bought a total 510 pencils, how much did Opal collect from the sale of all the pencils?
|
Pencil H |
Pencil J |
Pencil K |
Total |
Ratio of pencil |
4 u |
2 u |
9 u |
15 u |
Value of each pencil |
$2.20 |
$0.70 |
$0.50 |
|
15 u = 510
1 u = 510 ÷ 15 = 34
Number of Pencil H
= 4 x 34
= 136
Number of Pencil J
= 2 x 34
= 68
Number of Pencil K
= 9 x 34
= 306
Total revenue
= 136 x 2.20 + 68 x 0.70 + 306 x 0.50
= 299.20 + 47.60 + 153.00
= $499.80
Answer(s): $499.80