A store had 640 novels. There were English, Malay and Chinese novels in the ratio of 3 : 5 : 8. When the store assistant brought in another 432 new novels, the number of English novels was increased by 60% and the number of Malay novels was increased by ³₅.

1. What was the number of Chinese novels that the 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	8 u	640
Change	+ 1.8 u	+ 3 u	+ ?	+ 432
After	4.8 u	8 u	14 u	1072

Increase in the number of English novels
= 60% x 3 u
= ⁶⁰₁₀₀ x 3 u
= 1.8 u

Increase in the number of Malay novels
= ³₅ x 5 u
= 3 u

Total number of novels at first
= 3 u + 5 u + 8 u
= 16 u

16 u = 640

1 u = 640 ÷ 16 = 40

Increase in the number of English and Malay novels
= 1.8 u + 3 u
= 4.8 u
= 4.8 x 40
= 192

Number of Chinese novels brought in
= 432 - 192
= 240 

(b)
Number of Chinese novels at first
= 8 u
= 8 x 40
= 320

Percentage increase in Chinese novels
= ²⁴⁰₃₂₀ x 100%
= 75%

Answer(s): (a) 240; (b) 75%