A book shop had 1575 novels. There were Chinese, English and Malay novels in the ratio of 7 : 6 : 8. When the book shop assistant brought in another 780 new novels, the number of Chinese novels was increased by 20% and the number of English novels was increased by ⁵₆.

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	7 u	6 u	8 u	1575
Change	+ 1.4 u	+ 5 u	+ ?	+ 780
After	8.4 u	11 u	12 u	2355

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
= ⁵₆ x 6 u
= 5 u

Total number of novels at first
= 7 u + 6 u + 8 u
= 21 u

21 u = 1575

1 u = 1575 ÷ 21 = 75

Increase in the number of Chinese and English novels
= 1.4 u + 5 u
= 6.4 u
= 6.4 x 75
= 480

Number of Malay novels brought in
= 780 - 480
= 300 

(b)
Number of Malay novels at first
= 8 u
= 8 x 75
= 600

Percentage increase in Malay novels
= ³⁰⁰₆₀₀ x 100%
= 50%

Answer(s): (a) 300; (b) 50%