A shop had 720 novels. There were English, Malay and Chinese novels in the ratio of 3 : 7 : 2. When the shop assistant brought in another 336 new novels, the number of English novels was increased by 20% and the number of Malay novels was increased by ⁴₇.

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

	English	Malay	Chinese	Total
Before	3 u	7 u	2 u	720
Change	+ 0.6 u	+ 4 u	+ ?	+ 336
After	3.6 u	11 u	3 u	1056

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
= ⁴₇ x 7 u
= 4 u

Total number of novels at first
= 3 u + 7 u + 2 u
= 12 u

12 u = 720

1 u = 720 ÷ 12 = 60

Increase in the number of English and Malay novels
= 0.6 u + 4 u
= 4.6 u
= 4.6 x 60
= 276

Number of Chinese novels brought in
= 336 - 276
= 60 

(b)
Number of Chinese novels at first
= 2 u
= 2 x 60
= 120

Percentage increase in Chinese novels
= ⁶⁰₁₂₀ x 100%
= 50%

Answer(s): (a) 60; (b) 50%