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

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

(a)
Number of yellow files sold in Shop C = 120
Number of green files sold in Shop C = 100
Number of purple files sold in Shop C = 60

Since orange files sold in Shop C is half of the files sold by Shop C, the total of yellow files, green files and purple files is equal to orange files.

Number of orange files sold in Shop C
= 120 + 100 + 60
= 280

(b)
Number of yellow files sold in Shop C = 120 (More)
Number of yellow files sold in Shop D = 60

Number of green files sold in Shop C = 100 (Equal)
Number of green files sold in Shop D = 100

Number of purple files sold in Shop C = 60 (Less) 
Number of purple files sold in Shop D = 140

Number of orange files sold in Shop C = 280 (More) 
Number of orange files sold in Shop D = 160 

Colour(s) of files that Shop C sold less than Shop D = Purple (P)

(c)
Percentage increase in the number of yellow files sold by Shop D from November to December
= ¹⁵₆₀ x 100%
= ¹₄ x 100%
= 25%

Answer(s): (a) 280; (b) P; (c) 25%