PSLE
Stationery Kiosks W and X sell punchers of four colours. The bar graphs show the number of punchers sold by each shop in February. The bar for the number purple punchers sold by Stationery Kiosk W has not been drawn.

1. Half of the punchers sold by Stationery Kiosk W were purple punchers. How many purple punchers did Stationery Kiosk W sell?
2. Which colour(s) of punchers did Stationery Kiosk W sell less than Stationery Kiosk X? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In March, Stationery Kiosk X sold 10 more pink punchers than the number of pink punchers sold in February. What was the percentage increase in the number of pink punchers sold by Stationery Kiosk X from February to March?

(a)
Number of pink punchers sold in Stationery Kiosk W = 150
Number of blue punchers sold in Stationery Kiosk W = 100
Number of green punchers sold in Stationery Kiosk W = 100

Since purple punchers sold in Stationery Kiosk W is half of the punchers sold by Stationery Kiosk W, the total of pink punchers, blue punchers and green punchers is equal to purple punchers.

Number of purple punchers sold in Stationery Kiosk W
= 150 + 100 + 100
= 350

(b)
Number of pink punchers sold in Stationery Kiosk W = 150 (More)
Number of pink punchers sold in Stationery Kiosk X = 100

Number of blue punchers sold in Stationery Kiosk W = 100 (Equal)
Number of blue punchers sold in Stationery Kiosk X = 100

Number of green punchers sold in Stationery Kiosk W = 100 (Less) 
Number of green punchers sold in Stationery Kiosk X = 175

Number of purple punchers sold in Stationery Kiosk W = 350 (More) 
Number of purple punchers sold in Stationery Kiosk X = 175 

Colour(s) of punchers that Stationery Kiosk W sold less than Stationery Kiosk X = Green (G)

(c)
Percentage increase in the number of pink punchers sold by Stationery Kiosk X from February to March
= ¹⁰₁₀₀ x 100%
= ¹₁₀ x 100%
= 10%

Answer(s): (a) 350; (b) G; (c) 10%