A book store had 440 comics. There were Malay, Chinese and English comics in the ratio of 1 : 6 : 4. When the book store assistant brought in another 184 new comics, the number of Malay comics was increased by 60% and the number of Chinese comics was increased by ¹₂.

1. What was the number of English comics that the book store assistant brought in?
2. What was the percentage increase in the number of English comics?

	Malay	Chinese	English	Total
Before	1 u	6 u	4 u	440
Change	+ 0.6 u	+ 3 u	+ ?	+ 184
After	1.6 u	9 u	5 u	624

Increase in the number of Malay comics
= 60% x 1 u
= ⁶⁰₁₀₀ x 1 u
= 0.6 u

Increase in the number of Chinese comics
= ¹₂ x 6 u
= 3 u

Total number of comics at first
= 1 u + 6 u + 4 u
= 11 u

11 u = 440

1 u = 440 ÷ 11 = 40

Increase in the number of Malay and Chinese comics
= 0.6 u + 3 u
= 3.6 u
= 3.6 x 40
= 144

Number of English comics brought in
= 184 - 144
= 40 

(b)
Number of English comics at first
= 4 u
= 4 x 40
= 160

Percentage increase in English comics
= ⁴⁰₁₆₀ x 100%
= 25%

Answer(s): (a) 40; (b) 25%