A book shop had 1300 novels. There were Malay, Chinese and English novels in the ratio of 8 : 7 : 5. When the book shop assistant brought in another 429 new novels, the number of Malay novels was increased by 20% and the number of Chinese novels was increased by ²₇.

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

	Malay	Chinese	English	Total
Before	8 u	7 u	5 u	1300
Change	+ 1.6 u	+ 2 u	+ ?	+ 429
After	9.6 u	9 u	8 u	1729

Increase in the number of Malay novels
= 20% x 8 u
= ²⁰₁₀₀ x 8 u
= 1.6 u

Increase in the number of Chinese novels
= ²₇ x 7 u
= 2 u

Total number of novels at first
= 8 u + 7 u + 5 u
= 20 u

20 u = 1300

1 u = 1300 ÷ 20 = 65

Increase in the number of Malay and Chinese novels
= 1.6 u + 2 u
= 3.6 u
= 3.6 x 65
= 234

Number of English novels brought in
= 429 - 234
= 195 

(b)
Number of English novels at first
= 5 u
= 5 x 65
= 325

Percentage increase in English novels
= ¹⁹⁵₃₂₅ x 100%
= 60%

Answer(s): (a) 195; (b) 60%