PSLE
Stores K and L sell staplers of four colours. The bar graphs show the number of staplers sold by each shop in January. The bar for the number purple staplers sold by Store K has not been drawn.

1. Half of the staplers sold by Store K were purple staplers. How many purple staplers did Store K sell?
2. Which colour(s) of staplers did Store K sell less than Store L? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In February, Store L sold 15 less orange staplers than the number of orange staplers sold in January. What was the percentage increase in the number of orange staplers sold by Store L from January to February?

(a)
Number of green staplers sold in Store K = 40
Number of orange staplers sold in Store K = 140
Number of pink staplers sold in Store K = 200

Since purple staplers sold in Store K is half of the staplers sold by Store K, the total of orange staplers, pink staplers and green staplers is equal to purple staplers.

Number of purple staplers sold in Store K
= 140 + 200 + 40
= 380

(b)
Number of green staplers sold in Store K = 40 (Less) 
Number of green staplers sold in Store L = 120

Number of orange staplers sold in Store K = 140 (More)
Number of orange staplers sold in Store L = 20

Number of pink staplers sold in Store K = 200 (Equal)
Number of pink staplers sold in Store L = 200

Number of purple staplers sold in Store K = 380 (More) 
Number of purple staplers sold in Store L = 120 

Colour(s) of staplers that Store K sold less than Store L = Green (G)

(c)
Percentage decrease in the number of orange staplers sold by Store L from January to February
= ¹⁵₂₀ x 100%
= ³₄ x 100%
= 75%

Answer(s): (a) 380; (b) G; (c) 75%