PSLE
Bookstores C and D sell punchers of four colours. The bar graphs show the number of punchers sold by each shop in October. The bar for the number purple punchers sold by Bookstore C has not been drawn.

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

(a)
Number of yellow punchers sold in Bookstore C = 90
Number of pink punchers sold in Bookstore C = 100
Number of green punchers sold in Bookstore C = 30

Since purple punchers sold in Bookstore C is half of the punchers sold by Bookstore C, the total of yellow punchers, pink punchers and green punchers is equal to purple punchers.

Number of purple punchers sold in Bookstore C
= 90 + 100 + 30
= 220

(b)
Number of yellow punchers sold in Bookstore C = 90 (More)
Number of yellow punchers sold in Bookstore D = 50

Number of pink punchers sold in Bookstore C = 100 (Equal)
Number of pink punchers sold in Bookstore D = 100

Number of green punchers sold in Bookstore C = 30 (Less) 
Number of green punchers sold in Bookstore D = 60

Number of purple punchers sold in Bookstore C = 220 (More) 
Number of purple punchers sold in Bookstore D = 70 

Colour(s) of punchers that Bookstore C sold less than Bookstore D = Green (G)

(c)
Percentage increase in the number of yellow punchers sold by Bookstore D from October to November
= ⁴⁰₅₀ x 100%
= ⁴₅ x 100%
= 80%

Answer(s): (a) 220; (b) G; (c) 80%