A store had 945 fiction books. There were English, Malay and Chinese fiction books in the ratio of 6 : 7 : 8. When the store assistant brought in another 468 new fiction books, the number of English fiction books was increased by 40% and the number of Malay fiction books was increased by ⁶₇.

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

	English	Malay	Chinese	Total
Before	6 u	7 u	8 u	945
Change	+ 2.4 u	+ 6 u	+ ?	+ 468
After	8.4 u	13 u	10 u	1413

Increase in the number of English fiction books
= 40% x 6 u
= ⁴⁰₁₀₀ x 6 u
= 2.4 u

Increase in the number of Malay fiction books
= ⁶₇ x 7 u
= 6 u

Total number of fiction books at first
= 6 u + 7 u + 8 u
= 21 u

21 u = 945

1 u = 945 ÷ 21 = 45

Increase in the number of English and Malay fiction books
= 2.4 u + 6 u
= 8.4 u
= 8.4 x 45
= 378

Number of Chinese fiction books brought in
= 468 - 378
= 90 

(b)
Number of Chinese fiction books at first
= 8 u
= 8 x 45
= 360

Percentage increase in Chinese fiction books
= ⁹⁰₃₆₀ x 100%
= 25%

Answer(s): (a) 90; (b) 25%