A book store had 990 fiction books. There were Malay, Chinese and English fiction books in the ratio of 7 : 6 : 5. When the book store assistant brought in another 484 new fiction books, the number of Malay fiction books was increased by 40% and the number of Chinese fiction books was increased by ²₃.

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

	Malay	Chinese	English	Total
Before	7 u	6 u	5 u	990
Change	+ 2.8 u	+ 4 u	+ ?	+ 484
After	9.8 u	10 u	7 u	1474

Increase in the number of Malay fiction books
= 40% x 7 u
= ⁴⁰₁₀₀ x 7 u
= 2.8 u

Increase in the number of Chinese fiction books
= ²₃ x 6 u
= 4 u

Total number of fiction books at first
= 7 u + 6 u + 5 u
= 18 u

18 u = 990

1 u = 990 ÷ 18 = 55

Increase in the number of Malay and Chinese fiction books
= 2.8 u + 4 u
= 6.8 u
= 6.8 x 55
= 374

Number of English fiction books brought in
= 484 - 374
= 110 

(b)
Number of English fiction books at first
= 5 u
= 5 x 55
= 275

Percentage increase in English fiction books
= ¹¹⁰₂₇₅ x 100%
= 40%

Answer(s): (a) 110; (b) 40%