PSLE
Stationery Kiosks J and K sell folders of four colours. The bar graphs show the number of folders sold by each shop in August. The bar for the number purple folders sold by Stationery Kiosk J has not been drawn.

1. Half of the folders sold by Stationery Kiosk J were purple folders. How many purple folders did Stationery Kiosk J sell?
2. Which colour(s) of folders did Stationery Kiosk J sell less than Stationery Kiosk K? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In September, Stationery Kiosk K sold 5 more orange folders than the number of orange folders sold in August. What was the percentage increase in the number of orange folders sold by Stationery Kiosk K from August to September?

(a)
Number of orange folders sold in Stationery Kiosk J = 160
Number of pink folders sold in Stationery Kiosk J = 160
Number of yellow folders sold in Stationery Kiosk J = 20

Since purple folders sold in Stationery Kiosk J is half of the folders sold by Stationery Kiosk J, the total of orange folders, pink folders and yellow folders is equal to purple folders.

Number of purple folders sold in Stationery Kiosk J
= 160 + 160 + 20
= 340

(b)
Number of orange folders sold in Stationery Kiosk J = 160 (More)
Number of orange folders sold in Stationery Kiosk K = 20

Number of pink folders sold in Stationery Kiosk J = 160 (Equal)
Number of pink folders sold in Stationery Kiosk K = 160

Number of yellow folders sold in Stationery Kiosk J = 20 (Less) 
Number of yellow folders sold in Stationery Kiosk K = 120

Number of purple folders sold in Stationery Kiosk J = 340 (More) 
Number of purple folders sold in Stationery Kiosk K = 180 

Colour(s) of folders that Stationery Kiosk J sold less than Stationery Kiosk K = Yellow (Y)

(c)
Percentage increase in the number of orange folders sold by Stationery Kiosk K from August to September
= ⁵₂₀ x 100%
= ¹₄ x 100%
= 25%

Answer(s): (a) 340; (b) Y; (c) 25%