PSLE
Book Shops V and W sell staplers of four colours. The bar graphs show the number of staplers sold by each shop in July. The bar for the number yellow staplers sold by Book Shop V has not been drawn.

1. Half of the staplers sold by Book Shop V were yellow staplers. How many yellow staplers did Book Shop V sell?
2. Which colour(s) of staplers did Book Shop V sell less than Book Shop W? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In August, Book Shop W sold 45 more purple staplers than the number of purple staplers sold in July. What was the percentage increase in the number of purple staplers sold by Book Shop W from July to August?

(a)
Number of purple staplers sold in Book Shop V = 140
Number of pink staplers sold in Book Shop V = 80
Number of blue staplers sold in Book Shop V = 100

Since yellow staplers sold in Book Shop V is half of the staplers sold by Book Shop V, the total of purple staplers, pink staplers and blue staplers is equal to yellow staplers.

Number of yellow staplers sold in Book Shop V
= 140 + 80 + 100
= 320

(b)
Number of purple staplers sold in Book Shop V = 140 (More)
Number of purple staplers sold in Book Shop W = 60

Number of pink staplers sold in Book Shop V = 80 (Equal)
Number of pink staplers sold in Book Shop W = 80

Number of blue staplers sold in Book Shop V = 100 (Less) 
Number of blue staplers sold in Book Shop W = 180

Number of yellow staplers sold in Book Shop V = 320 (More) 
Number of yellow staplers sold in Book Shop W = 120 

Colour(s) of staplers that Book Shop V sold less than Book Shop W = Blue (B)

(c)
Percentage increase in the number of purple staplers sold by Book Shop W from July to August
= ⁴⁵₆₀ x 100%
= ³₄ x 100%
= 75%

Answer(s): (a) 320; (b) B; (c) 75%