PSLE
Reggie had green staplers and purple staplers for sale. He sold 360 green staplers. 40% of the staplers sold were purple.

1. How many green staplers and purple staplers did Reggie sell altogether?
2. He sold 50% of his staplers. 75% of the staplers left unsold were green. How many purple staplers did Reggie have at first?

	Green	Purple	Total	Total in percent
Before	6.75 u	3.25 u	10 u	100%
Change	- 60% - 3 u	- 40% - 2 u	- 100% - 5 u	- 50%
After	75% 3.75 u	25% 1.25 u	100% 5 u	50%

40% = ⁴⁰₁₀₀ = ²₅

Total number of staplers sold = 5 u
Number of purple staplers sold = 2 u

Number of green staplers sold
= 5 u - 2 u
= 3 u

3 u = 360

1 u = 360 ÷ 3 = 120

Total number of staplers sold
= 5 u
= 5 x 120
= 600

(b)
Percent of the staplers left unsold
= 100% - 50%
= 50%

50% of the staplers that were sold = 5 u
50% of the staplers that were left unsold = 5 u

Percent of the staplers left unsold that were green = 75%
Percent of the staplers left unsold that were purple = 100% - 75% = 25%

Number of the staplers left unsold that were purple
= 25% x 5 u
= ²⁵₁₀₀ x 5 u
= 1.25 u

Number of purple staplers that Reggie had at first
= 1.25 u + 2 u
= 3.25 u
= 3.25 x 120
= 390

Answer(s): (a) 600; (b) 390