A shop had 1050 fiction books. There were Chinese, English and Malay fiction books in the ratio of 2 : 7 : 5. When the shop assistant brought in another 510 new fiction books, the number of Chinese fiction books was increased by 40% and the number of English fiction books was increased by ³₇.

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

	Chinese	English	Malay	Total
Before	2 u	7 u	5 u	1050
Change	+ 0.8 u	+ 3 u	+ ?	+ 510
After	2.8 u	10 u	8 u	1560

Increase in the number of Chinese fiction books
= 40% x 2 u
= ⁴⁰₁₀₀ x 2 u
= 0.8 u

Increase in the number of English fiction books
= ³₇ x 7 u
= 3 u

Total number of fiction books at first
= 2 u + 7 u + 5 u
= 14 u

14 u = 1050

1 u = 1050 ÷ 14 = 75

Increase in the number of Chinese and English fiction books
= 0.8 u + 3 u
= 3.8 u
= 3.8 x 75
= 285

Number of Malay fiction books brought in
= 510 - 285
= 225 

(b)
Number of Malay fiction books at first
= 5 u
= 5 x 75
= 375

Percentage increase in Malay fiction books
= ²²⁵₃₇₅ x 100%
= 60%

Answer(s): (a) 225; (b) 60%