A store had 980 comics. There were English, Malay and Chinese comics in the ratio of 1 : 5 : 8. When the store assistant brought in another 574 new comics, the number of English comics was increased by 20% and the number of Malay comics was increased by ⁴₅.

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

	English	Malay	Chinese	Total
Before	1 u	5 u	8 u	980
Change	+ 0.2 u	+ 4 u	+ ?	+ 574
After	1.2 u	9 u	12 u	1554

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
= ⁴₅ x 5 u
= 4 u

Total number of comics at first
= 1 u + 5 u + 8 u
= 14 u

14 u = 980

1 u = 980 ÷ 14 = 70

Increase in the number of English and Malay comics
= 0.2 u + 4 u
= 4.2 u
= 4.2 x 70
= 294

Number of Chinese comics brought in
= 574 - 294
= 280 

(b)
Number of Chinese comics at first
= 8 u
= 8 x 70
= 560

Percentage increase in Chinese comics
= ²⁸⁰₅₆₀ x 100%
= 50%

Answer(s): (a) 280; (b) 50%