A shop had 630 novels. There were Malay, Chinese and English novels in the ratio of 1 : 5 : 8. When the shop assistant brought in another 252 new novels, the number of Malay novels was increased by 60% and the number of Chinese novels was increased by ¹₅.

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

	Malay	Chinese	English	Total
Before	1 u	5 u	8 u	630
Change	+ 0.6 u	+ 1 u	+ ?	+ 252
After	1.6 u	6 u	12 u	882

Increase in the number of Malay novels
= 60% x 1 u
= ⁶⁰₁₀₀ x 1 u
= 0.6 u

Increase in the number of Chinese novels
= ¹₅ x 5 u
= 1 u

Total number of novels at first
= 1 u + 5 u + 8 u
= 14 u

14 u = 630

1 u = 630 ÷ 14 = 45

Increase in the number of Malay and Chinese novels
= 0.6 u + 1 u
= 1.6 u
= 1.6 x 45
= 72

Number of English novels brought in
= 252 - 72
= 180 

(b)
Number of English novels at first
= 8 u
= 8 x 45
= 360

Percentage increase in English novels
= ¹⁸⁰₃₆₀ x 100%
= 50%

Answer(s): (a) 180; (b) 50%