A book shop had 910 comics. There were Chinese, English and Malay comics in the ratio of 3 : 6 : 4. When the book shop assistant brought in another 406 new comics, the number of Chinese comics was increased by 60% and the number of English comics was increased by ¹₃.

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

	Chinese	English	Malay	Total
Before	3 u	6 u	4 u	910
Change	+ 1.8 u	+ 2 u	+ ?	+ 406
After	4.8 u	8 u	6 u	1316

Increase in the number of Chinese comics
= 60% x 3 u
= ⁶⁰₁₀₀ x 3 u
= 1.8 u

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

Total number of comics at first
= 3 u + 6 u + 4 u
= 13 u

13 u = 910

1 u = 910 ÷ 13 = 70

Increase in the number of Chinese and English comics
= 1.8 u + 2 u
= 3.8 u
= 3.8 x 70
= 266

Number of Malay comics brought in
= 406 - 266
= 140 

(b)
Number of Malay comics at first
= 4 u
= 4 x 70
= 280

Percentage increase in Malay comics
= ¹⁴⁰₂₈₀ x 100%
= 50%

Answer(s): (a) 140; (b) 50%