PSLE
Shops D and E sell notebooks of four colours. The bar graphs show the number of notebooks sold by each shop in November. The bar for the number green notebooks sold by Shop D has not been drawn.

1. Half of the notebooks sold by Shop D were green notebooks. How many green notebooks did Shop D sell?
2. Which colour(s) of notebooks did Shop D sell less than Shop E? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In December, Shop E sold 15 more pink notebooks than the number of pink notebooks sold in November. What was the percentage increase in the number of pink notebooks sold by Shop E from November to December?

(a)
Number of pink notebooks sold in Shop D = 150
Number of orange notebooks sold in Shop D = 150
Number of purple notebooks sold in Shop D = 75

Since green notebooks sold in Shop D is half of the notebooks sold by Shop D, the total of pink notebooks, orange notebooks and purple notebooks is equal to green notebooks.

Number of green notebooks sold in Shop D
= 150 + 150 + 75
= 375

(b)
Number of pink notebooks sold in Shop D = 150 (More)
Number of pink notebooks sold in Shop E = 125

Number of orange notebooks sold in Shop D = 150 (Equal)
Number of orange notebooks sold in Shop E = 150

Number of purple notebooks sold in Shop D = 75 (Less) 
Number of purple notebooks sold in Shop E = 200

Number of green notebooks sold in Shop D = 375 (More) 
Number of green notebooks sold in Shop E = 75 

Colour(s) of notebooks that Shop D sold less than Shop E = Purple (P)

(c)
Percentage increase in the number of pink notebooks sold by Shop E from November to December
= ¹⁵₁₂₅ x 100%
= ³₂₅ x 100%
= 12%

Answer(s): (a) 375; (b) P; (c) 12%