A book store had 780 fiction books. There were Malay, Chinese and English fiction books in the ratio of 6 : 3 : 4. When the book store assistant brought in another 516 new fiction books, the number of Malay fiction books was increased by 60% 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	6 u	3 u	4 u	780
Change	+ 3.6 u	+ 2 u	+ ?	+ 516
After	9.6 u	5 u	7 u	1296

Increase in the number of Malay fiction books
= 60% x 6 u
= ⁶⁰₁₀₀ x 6 u
= 3.6 u

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

Total number of fiction books at first
= 6 u + 3 u + 4 u
= 13 u

13 u = 780

1 u = 780 ÷ 13 = 60

Increase in the number of Malay and Chinese fiction books
= 3.6 u + 2 u
= 5.6 u
= 5.6 x 60
= 336

Number of English fiction books brought in
= 516 - 336
= 180 

(b)
Number of English fiction books at first
= 4 u
= 4 x 60
= 240

Percentage increase in English fiction books
= ¹⁸⁰₂₄₀ x 100%
= 75%

Answer(s): (a) 180; (b) 75%