PSLE
Stationery Shops P and Q sell staplers of four colours. The bar graphs show the number of staplers sold by each shop in October. The bar for the number blue staplers sold by Stationery Shop P has not been drawn.

1. Half of the staplers sold by Stationery Shop P were blue staplers. How many blue staplers did Stationery Shop P sell?
2. Which colour(s) of staplers did Stationery Shop P sell less than Stationery Shop Q? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In November, Stationery Shop Q sold 50 more purple staplers than the number of purple staplers sold in October. What was the percentage increase in the number of purple staplers sold by Stationery Shop Q from October to November?

(a)
Number of purple staplers sold in Stationery Shop P = 200
Number of yellow staplers sold in Stationery Shop P = 150
Number of orange staplers sold in Stationery Shop P = 125

Since blue staplers sold in Stationery Shop P is half of the staplers sold by Stationery Shop P, the total of purple staplers, yellow staplers and orange staplers is equal to blue staplers.

Number of blue staplers sold in Stationery Shop P
= 200 + 150 + 125
= 475

(b)
Number of purple staplers sold in Stationery Shop P = 200 (More)
Number of purple staplers sold in Stationery Shop Q = 100

Number of yellow staplers sold in Stationery Shop P = 150 (Equal)
Number of yellow staplers sold in Stationery Shop Q = 150

Number of orange staplers sold in Stationery Shop P = 125 (Less) 
Number of orange staplers sold in Stationery Shop Q = 225

Number of blue staplers sold in Stationery Shop P = 475 (More) 
Number of blue staplers sold in Stationery Shop Q = 200 

Colour(s) of staplers that Stationery Shop P sold less than Stationery Shop Q = Orange (O)

(c)
Percentage increase in the number of purple staplers sold by Stationery Shop Q from October to November
= ⁵⁰₁₀₀ x 100%
= ¹₂ x 100%
= 50%

Answer(s): (a) 475; (b) O; (c) 50%