PSLE Simon had red staplers and purple staplers for sale. He sold 350 red staplers. 30% of the staplers sold were purple.
- How many red staplers and purple staplers did Simon sell altogether?
- He sold 50% of his staplers. 75% of the staplers left unsold were red. How many purple staplers did Simon have at first?
|
Red |
Purple |
Total |
Total in percent |
Before |
14.5 u |
5.5 u |
20 u |
100% |
Change |
- 70% - 7 u |
- 30% - 3 u |
- 100% - 10 u |
- 50% |
After |
75% 7.5 u |
25% 2.5 u |
100% 10 u |
50%
|
30% =
30100 =
310 Total number of staplers sold = 10 u
Number of purple staplers sold = 3 u
Number of red staplers sold
= 10 u - 3 u
= 7 u
7 u = 350
1 u = 350 ÷ 7 = 50
Total number of staplers sold
= 10 u
= 10 x 50
= 500
(b)
Percent of the staplers left unsold = 100% - 50% = 50% 50% of the staplers that were sold = 10 u 50% of the staplers that were left unsold = 10 u Percent of the staplers left unsold that were red = 75%
Percent of the staplers left unsold that were purple = 100% - 75% = 25%
Number of the staplers left unsold that were purple
= 25% x 10 u
=
25100 x 10 u
= 2.5 u
Number of purple staplers that Simon had at first
= 2.5 u + 3 u
= 5.5 u
= 5.5 x 50
= 275
Answer(s): (a) 500; (b) 275