A book shop had 1050 comics. There were Malay, Chinese and English comics in the ratio of 7 : 6 : 2. When the book shop assistant brought in another 308 new comics, the number of Malay comics was increased by 20% and the number of Chinese comics was increased by ¹₃.

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

	Malay	Chinese	English	Total
Before	7 u	6 u	2 u	1050
Change	+ 1.4 u	+ 2 u	+ ?	+ 308
After	8.4 u	8 u	3 u	1358

Increase in the number of Malay comics
= 20% x 7 u
= ²⁰₁₀₀ x 7 u
= 1.4 u

Increase in the number of Chinese comics
= ¹₃ x 6 u
= 2 u

Total number of comics at first
= 7 u + 6 u + 2 u
= 15 u

15 u = 1050

1 u = 1050 ÷ 15 = 70

Increase in the number of Malay and Chinese comics
= 1.4 u + 2 u
= 3.4 u
= 3.4 x 70
= 238

Number of English comics brought in
= 308 - 238
= 70 

(b)
Number of English comics at first
= 2 u
= 2 x 70
= 140

Percentage increase in English comics
= ⁷⁰₁₄₀ x 100%
= 50%

Answer(s): (a) 70; (b) 50%