A book shop had 1200 fiction books. There were Chinese, English and Malay fiction books in the ratio of 3 : 4 : 8. When the book shop assistant brought in another 528 new fiction books, the number of Chinese fiction books was increased by 20% and the number of English fiction books was increased by ¹₂.

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

	Chinese	English	Malay	Total
Before	3 u	4 u	8 u	1200
Change	+ 0.6 u	+ 2 u	+ ?	+ 528
After	3.6 u	6 u	12 u	1728

Increase in the number of Chinese fiction books
= 20% x 3 u
= ²⁰₁₀₀ x 3 u
= 0.6 u

Increase in the number of English fiction books
= ¹₂ x 4 u
= 2 u

Total number of fiction books at first
= 3 u + 4 u + 8 u
= 15 u

15 u = 1200

1 u = 1200 ÷ 15 = 80

Increase in the number of Chinese and English fiction books
= 0.6 u + 2 u
= 2.6 u
= 2.6 x 80
= 208

Number of Malay fiction books brought in
= 528 - 208
= 320 

(b)
Number of Malay fiction books at first
= 8 u
= 8 x 80
= 640

Percentage increase in Malay fiction books
= ³²⁰₆₄₀ x 100%
= 50%

Answer(s): (a) 320; (b) 50%