A store had 300 novels. There were Malay, Chinese and English novels in the ratio of 3 : 8 : 4. When the store assistant brought in another 192 new novels, the number of Malay novels was increased by 20% and the number of Chinese novels was increased by ³₄.

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

	Malay	Chinese	English	Total
Before	3 u	8 u	4 u	300
Change	+ 0.6 u	+ 6 u	+ ?	+ 192
After	3.6 u	14 u	7 u	492

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

Increase in the number of Chinese novels
= ³₄ x 8 u
= 6 u

Total number of novels at first
= 3 u + 8 u + 4 u
= 15 u

15 u = 300

1 u = 300 ÷ 15 = 20

Increase in the number of Malay and Chinese novels
= 0.6 u + 6 u
= 6.6 u
= 6.6 x 20
= 132

Number of English novels brought in
= 192 - 132
= 60 

(b)
Number of English novels at first
= 4 u
= 4 x 20
= 80

Percentage increase in English novels
= ⁶⁰₈₀ x 100%
= 75%

Answer(s): (a) 60; (b) 75%