PSLE
Stores H and J sell notebooks of four colours. The bar graphs show the number of notebooks sold by each shop in November. The bar for the number purple notebooks sold by Store H has not been drawn.

1. Half of the notebooks sold by Store H were purple notebooks. How many purple notebooks did Store H sell?
2. Which colour(s) of notebooks did Store H sell less than Store J? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In December, Store J sold 20 more yellow notebooks than the number of yellow notebooks sold in November. What was the percentage increase in the number of yellow notebooks sold by Store J from November to December?

(a)
Number of yellow notebooks sold in Store H = 175
Number of blue notebooks sold in Store H = 225
Number of green notebooks sold in Store H = 125

Since purple notebooks sold in Store H is half of the notebooks sold by Store H, the total of yellow notebooks, blue notebooks and green notebooks is equal to purple notebooks.

Number of purple notebooks sold in Store H
= 175 + 225 + 125
= 525

(b)
Number of yellow notebooks sold in Store H = 175 (More)
Number of yellow notebooks sold in Store J = 25

Number of blue notebooks sold in Store H = 225 (Equal)
Number of blue notebooks sold in Store J = 225

Number of green notebooks sold in Store H = 125 (Less) 
Number of green notebooks sold in Store J = 225

Number of purple notebooks sold in Store H = 525 (More) 
Number of purple notebooks sold in Store J = 100 

Colour(s) of notebooks that Store H sold less than Store J = Green (G)

(c)
Percentage increase in the number of yellow notebooks sold by Store J from November to December
= ²⁰₂₅ x 100%
= ⁴₅ x 100%
= 80%

Answer(s): (a) 525; (b) G; (c) 80%