PSLE
Stores R and S sell folders of four colours. The bar graphs show the number of folders sold by each shop in July. The bar for the number pink folders sold by Store R has not been drawn.

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

(a)
Number of yellow folders sold in Store R = 25
Number of purple folders sold in Store R = 250
Number of orange folders sold in Store R = 125

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

Number of pink folders sold in Store R
= 250 + 125 + 25
= 400

(b)
Number of yellow folders sold in Store R = 25 (Less) 
Number of yellow folders sold in Store S = 150

Number of purple folders sold in Store R = 250 (More)
Number of purple folders sold in Store S = 75

Number of orange folders sold in Store R = 125 (Equal)
Number of orange folders sold in Store S = 125

Number of pink folders sold in Store R = 400 (More) 
Number of pink folders sold in Store S = 75 

Colour(s) of folders that Store R sold less than Store S = Yellow (Y)

(c)
Percentage decrease in the number of purple folders sold by Store S from July to August
= ⁴⁵₇₅ x 100%
= ³₅ x 100%
= 60%

Answer(s): (a) 400; (b) Y; (c) 60%