PSLE
Shops S and T sell notebooks of four colours. The bar graphs show the number of notebooks sold by each shop in June. The bar for the number purple notebooks sold by Shop S has not been drawn.

1. Half of the notebooks sold by Shop S were purple notebooks. How many purple notebooks did Shop S sell?
2. Which colour(s) of notebooks did Shop S sell less than Shop T? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In July, Shop T sold 30 more orange notebooks than the number of orange notebooks sold in June. What was the percentage increase in the number of orange notebooks sold by Shop T from June to July?

(a)
Number of orange notebooks sold in Shop S = 140
Number of blue notebooks sold in Shop S = 160
Number of yellow notebooks sold in Shop S = 100

Since purple notebooks sold in Shop S is half of the notebooks sold by Shop S, the total of orange notebooks, blue notebooks and yellow notebooks is equal to purple notebooks.

Number of purple notebooks sold in Shop S
= 140 + 160 + 100
= 400

(b)
Number of orange notebooks sold in Shop S = 140 (More)
Number of orange notebooks sold in Shop T = 100

Number of blue notebooks sold in Shop S = 160 (Equal)
Number of blue notebooks sold in Shop T = 160

Number of yellow notebooks sold in Shop S = 100 (Less) 
Number of yellow notebooks sold in Shop T = 180

Number of purple notebooks sold in Shop S = 400 (More) 
Number of purple notebooks sold in Shop T = 140 

Colour(s) of notebooks that Shop S sold less than Shop T = Yellow (Y)

(c)
Percentage increase in the number of orange notebooks sold by Shop T from June to July
= ³⁰₁₀₀ x 100%
= ³₁₀ x 100%
= 30%

Answer(s): (a) 400; (b) Y; (c) 30%