A book store had 540 fiction books. There were English, Malay and Chinese fiction books in the ratio of 7 : 3 : 2. When the book store assistant brought in another 198 new fiction books, the number of English fiction books was increased by 20% and the number of Malay fiction books was increased by ²₃.

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

	English	Malay	Chinese	Total
Before	7 u	3 u	2 u	540
Change	+ 1.4 u	+ 2 u	+ ?	+ 198
After	8.4 u	5 u	3 u	738

Increase in the number of English fiction books
= 20% x 7 u
= ²⁰₁₀₀ x 7 u
= 1.4 u

Increase in the number of Malay fiction books
= ²₃ x 3 u
= 2 u

Total number of fiction books at first
= 7 u + 3 u + 2 u
= 12 u

12 u = 540

1 u = 540 ÷ 12 = 45

Increase in the number of English and Malay fiction books
= 1.4 u + 2 u
= 3.4 u
= 3.4 x 45
= 153

Number of Chinese fiction books brought in
= 198 - 153
= 45 

(b)
Number of Chinese fiction books at first
= 2 u
= 2 x 45
= 90

Percentage increase in Chinese fiction books
= ⁴⁵₉₀ x 100%
= 50%

Answer(s): (a) 45; (b) 50%