PSLE
Stores D and E sell folders of four colours. The bar graphs show the number of folders sold by each shop in May. The bar for the number yellow folders sold by Store D has not been drawn.

1. Half of the folders sold by Store D were yellow folders. How many yellow folders did Store D sell?
2. Which colour(s) of folders did Store D sell less than Store E? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In June, Store E sold 5 more green folders than the number of green folders sold in May. What was the percentage increase in the number of green folders sold by Store E from May to June?

(a)
Number of green folders sold in Store D = 150
Number of pink folders sold in Store D = 250
Number of purple folders sold in Store D = 75

Since yellow folders sold in Store D is half of the folders sold by Store D, the total of green folders, pink folders and purple folders is equal to yellow folders.

Number of yellow folders sold in Store D
= 150 + 250 + 75
= 475

(b)
Number of green folders sold in Store D = 150 (More)
Number of green folders sold in Store E = 100

Number of pink folders sold in Store D = 250 (Equal)
Number of pink folders sold in Store E = 250

Number of purple folders sold in Store D = 75 (Less) 
Number of purple folders sold in Store E = 200

Number of yellow folders sold in Store D = 475 (More) 
Number of yellow folders sold in Store E = 175 

Colour(s) of folders that Store D sold less than Store E = Purple (P)

(c)
Percentage increase in the number of green folders sold by Store E from May to June
= ⁵₁₀₀ x 100%
= ¹₂₀ x 100%
= 5%

Answer(s): (a) 475; (b) P; (c) 5%