A book shop had 980 novels. There were Chinese, English and Malay novels in the ratio of 3 : 7 : 4. When the book shop assistant brought in another 182 new novels, the number of Chinese novels was increased by 20% and the number of English novels was increased by ¹₇.

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

	Chinese	English	Malay	Total
Before	3 u	7 u	4 u	980
Change	+ 0.6 u	+ 1 u	+ ?	+ 182
After	3.6 u	8 u	5 u	1162

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

Increase in the number of English novels
= ¹₇ x 7 u
= 1 u

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

14 u = 980

1 u = 980 ÷ 14 = 70

Increase in the number of Chinese and English novels
= 0.6 u + 1 u
= 1.6 u
= 1.6 x 70
= 112

Number of Malay novels brought in
= 182 - 112
= 70 

(b)
Number of Malay novels at first
= 4 u
= 4 x 70
= 280

Percentage increase in Malay novels
= ⁷⁰₂₈₀ x 100%
= 25%

Answer(s): (a) 70; (b) 25%