A book store had 120 novels. There were English, Malay and Chinese novels in the ratio of 3 : 5 : 4. When the book store assistant brought in another 56 new novels, the number of English novels was increased by 20% and the number of Malay novels was increased by ²₅.

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

	English	Malay	Chinese	Total
Before	3 u	5 u	4 u	120
Change	+ 0.6 u	+ 2 u	+ ?	+ 56
After	3.6 u	7 u	7 u	176

Increase in the number of English novels
= 20% x 3 u
= ²⁰₁₀₀ x 3 u
= 0.6 u

Increase in the number of Malay novels
= ²₅ x 5 u
= 2 u

Total number of novels at first
= 3 u + 5 u + 4 u
= 12 u

12 u = 120

1 u = 120 ÷ 12 = 10

Increase in the number of English and Malay novels
= 0.6 u + 2 u
= 2.6 u
= 2.6 x 10
= 26

Number of Chinese novels brought in
= 56 - 26
= 30 

(b)
Number of Chinese novels at first
= 4 u
= 4 x 10
= 40

Percentage increase in Chinese novels
= ³⁰₄₀ x 100%
= 75%

Answer(s): (a) 30; (b) 75%