A store had 1400 fiction books. There were Malay, Chinese and English fiction books in the ratio of 7 : 5 : 8. When the store assistant brought in another 616 new fiction books, the number of Malay fiction books was increased by 40% and the number of Chinese fiction books was increased by ²₅.

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

	Malay	Chinese	English	Total
Before	7 u	5 u	8 u	1400
Change	+ 2.8 u	+ 2 u	+ ?	+ 616
After	9.8 u	7 u	12 u	2016

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
= ²₅ x 5 u
= 2 u

Total number of fiction books at first
= 7 u + 5 u + 8 u
= 20 u

20 u = 1400

1 u = 1400 ÷ 20 = 70

Increase in the number of Malay and Chinese fiction books
= 2.8 u + 2 u
= 4.8 u
= 4.8 x 70
= 336

Number of English fiction books brought in
= 616 - 336
= 280 

(b)
Number of English fiction books at first
= 8 u
= 8 x 70
= 560

Percentage increase in English fiction books
= ²⁸⁰₅₆₀ x 100%
= 50%

Answer(s): (a) 280; (b) 50%