PSLE
Bookstores D and E sell files of four colours. The bar graphs show the number of files sold by each shop in May. The bar for the number green files sold by Bookstore D has not been drawn.

1. Half of the files sold by Bookstore D were green files. How many green files did Bookstore D sell?
2. Which colour(s) of files did Bookstore D sell less than Bookstore E? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In June, Bookstore E sold 40 more orange files than the number of orange files sold in May. What was the percentage increase in the number of orange files sold by Bookstore E from May to June?

(a)
Number of orange files sold in Bookstore D = 250
Number of purple files sold in Bookstore D = 225
Number of pink files sold in Bookstore D = 25

Since green files sold in Bookstore D is half of the files sold by Bookstore D, the total of orange files, purple files and pink files is equal to green files.

Number of green files sold in Bookstore D
= 250 + 225 + 25
= 500

(b)
Number of orange files sold in Bookstore D = 250 (More)
Number of orange files sold in Bookstore E = 125

Number of purple files sold in Bookstore D = 225 (Equal)
Number of purple files sold in Bookstore E = 225

Number of pink files sold in Bookstore D = 25 (Less) 
Number of pink files sold in Bookstore E = 225

Number of green files sold in Bookstore D = 500 (More) 
Number of green files sold in Bookstore E = 200 

Colour(s) of files that Bookstore D sold less than Bookstore E = Pink (P)

(c)
Percentage increase in the number of orange files sold by Bookstore E from May to June
= ⁴⁰₁₂₅ x 100%
= ⁸₂₅ x 100%
= 32%

Answer(s): (a) 500; (b) P; (c) 32%