During her shopping trip, Barbara bought three different types of crayons, Q, R and S in the ratio of 5 : 3 : 9. She decided to sell them at the prices listed as shown.
Crayon Q : $1.40
Crayon R : $0.80
Crayon S : $0.40
Given that Barbara bought a total 493 crayons, how much did Barbara collect from the sale of all the crayons?
|
Crayon Q |
Crayon R |
Crayon S |
Total |
Ratio of crayon |
5 u |
3 u |
9 u |
17 u |
Value of each crayon |
$1.40 |
$0.80 |
$0.40 |
|
17 u = 493
1 u = 493 ÷ 17 = 29
Number of Crayon Q
= 5 x 29
= 145
Number of Crayon R
= 3 x 29
= 87
Number of Crayon S
= 9 x 29
= 261
Total revenue
= 145 x 1.40 + 87 x 0.80 + 261 x 0.40
= 203.00 + 69.60 + 104.40
= $377.00
Answer(s): $377.00