During her shopping trip, Barbara bought three different types of pencils, C, D and E in the ratio of 6 : 2 : 7. She decided to sell them at the prices listed as shown.
Pencil C : $2.40
Pencil D : $0.75
Pencil E : $0.30
Given that Barbara bought a total 420 pencils, how much did Barbara collect from the sale of all the pencils?
|
Pencil C |
Pencil D |
Pencil E |
Total |
Ratio of pencil |
6 u |
2 u |
7 u |
15 u |
Value of each pencil |
$2.40 |
$0.75 |
$0.30 |
|
15 u = 420
1 u = 420 ÷ 15 = 28
Number of Pencil C
= 6 x 28
= 168
Number of Pencil D
= 2 x 28
= 56
Number of Pencil E
= 7 x 28
= 196
Total revenue
= 168 x 2.40 + 56 x 0.75 + 196 x 0.30
= 403.20 + 42.00 + 58.80
= $504.00
Answer(s): $504.00