A shop had 675 comics. There were English, Malay and Chinese comics in the ratio of 1 : 6 : 8. When the shop assistant brought in another 279 new comics, the number of English comics was increased by 20% and the number of Malay comics was increased by ²₃.

1. What was the number of Chinese comics that the shop assistant brought in?
2. What was the percentage increase in the number of Chinese comics?

	English	Malay	Chinese	Total
Before	1 u	6 u	8 u	675
Change	+ 0.2 u	+ 4 u	+ ?	+ 279
After	1.2 u	10 u	10 u	954

Increase in the number of English comics
= 20% x 1 u
= ²⁰₁₀₀ x 1 u
= 0.2 u

Increase in the number of Malay comics
= ²₃ x 6 u
= 4 u

Total number of comics at first
= 1 u + 6 u + 8 u
= 15 u

15 u = 675

1 u = 675 ÷ 15 = 45

Increase in the number of English and Malay comics
= 0.2 u + 4 u
= 4.2 u
= 4.2 x 45
= 189

Number of Chinese comics brought in
= 279 - 189
= 90 

(b)
Number of Chinese comics at first
= 8 u
= 8 x 45
= 360

Percentage increase in Chinese comics
= ⁹⁰₃₆₀ x 100%
= 25%

Answer(s): (a) 90; (b) 25%