During her shopping trip, Kathy bought three different types of pens, R, S and T in the ratio of 4 : 3 : 9. She decided to sell them at the prices listed as shown.
Pen R : $2.40
Pen S : $0.90
Pen T : $0.60
Given that Kathy bought a total 544 pens, how much did Kathy collect from the sale of all the pens?
|
Pen R |
Pen S |
Pen T |
Total |
Ratio of pen |
4 u |
3 u |
9 u |
16 u |
Value of each pen |
$2.40 |
$0.90 |
$0.60 |
|
16 u = 544
1 u = 544 ÷ 16 = 34
Number of Pen R
= 4 x 34
= 136
Number of Pen S
= 3 x 34
= 102
Number of Pen T
= 9 x 34
= 306
Total revenue
= 136 x 2.40 + 102 x 0.90 + 306 x 0.60
= 326.40 + 91.80 + 183.60
= $601.80
Answer(s): $601.80