During her shopping trip, Marion bought three different types of pencils, P, Q and R in the ratio of 6 : 2 : 7. She decided to sell them at the prices listed as shown.
Pencil P : $1.70
Pencil Q : $0.70
Pencil R : $0.40
Given that Marion bought a total 450 pencils, how much did Marion collect from the sale of all the pencils?
|
Pencil P |
Pencil Q |
Pencil R |
Total |
Ratio of pencil |
6 u |
2 u |
7 u |
15 u |
Value of each pencil |
$1.70 |
$0.70 |
$0.40 |
|
15 u = 450
1 u = 450 ÷ 15 = 30
Number of Pencil P
= 6 x 30
= 180
Number of Pencil Q
= 2 x 30
= 60
Number of Pencil R
= 7 x 30
= 210
Total revenue
= 180 x 1.70 + 60 x 0.70 + 210 x 0.40
= 306.00 + 42.00 + 84.00
= $432.00
Answer(s): $432.00