A shop had 560 novels. There were Chinese, English and Malay novels in the ratio of 7 : 3 : 4. When the shop assistant brought in another 176 new novels, the number of Chinese novels was increased by 20% and the number of English novels was increased by ²₃.

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

	Chinese	English	Malay	Total
Before	7 u	3 u	4 u	560
Change	+ 1.4 u	+ 2 u	+ ?	+ 176
After	8.4 u	5 u	5 u	736

Increase in the number of Chinese novels
= 20% x 7 u
= ²⁰₁₀₀ x 7 u
= 1.4 u

Increase in the number of English novels
= ²₃ x 3 u
= 2 u

Total number of novels at first
= 7 u + 3 u + 4 u
= 14 u

14 u = 560

1 u = 560 ÷ 14 = 40

Increase in the number of Chinese and English novels
= 1.4 u + 2 u
= 3.4 u
= 3.4 x 40
= 136

Number of Malay novels brought in
= 176 - 136
= 40 

(b)
Number of Malay novels at first
= 4 u
= 4 x 40
= 160

Percentage increase in Malay novels
= ⁴⁰₁₆₀ x 100%
= 25%

Answer(s): (a) 40; (b) 25%