During her shopping trip, Diana bought three different types of pens, C, D and E in the ratio of 6 : 3 : 9. She decided to sell them at the prices listed as shown.
Pen C : $2.60
Pen D : $0.70
Pen E : $0.50
Given that Diana bought a total 558 pens, how much did Diana collect from the sale of all the pens?
|
Pen C |
Pen D |
Pen E |
Total |
Ratio of pen |
6 u |
3 u |
9 u |
18 u |
Value of each pen |
$2.60 |
$0.70 |
$0.50 |
|
18 u = 558
1 u = 558 ÷ 18 = 31
Number of Pen C
= 6 x 31
= 186
Number of Pen D
= 3 x 31
= 93
Number of Pen E
= 9 x 31
= 279
Total revenue
= 186 x 2.60 + 93 x 0.70 + 279 x 0.50
= 483.60 + 65.10 + 139.50
= $688.20
Answer(s): $688.20