A shop had 750 fiction books. There were Malay, Chinese and English fiction books in the ratio of 2 : 8 : 5. When the shop assistant brought in another 290 new fiction books, the number of Malay fiction books was increased by 40% and the number of Chinese fiction books was increased by ³₈.

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

	Malay	Chinese	English	Total
Before	2 u	8 u	5 u	750
Change	+ 0.8 u	+ 3 u	+ ?	+ 290
After	2.8 u	11 u	7 u	1040

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

Increase in the number of Chinese fiction books
= ³₈ x 8 u
= 3 u

Total number of fiction books at first
= 2 u + 8 u + 5 u
= 15 u

15 u = 750

1 u = 750 ÷ 15 = 50

Increase in the number of Malay and Chinese fiction books
= 0.8 u + 3 u
= 3.8 u
= 3.8 x 50
= 190

Number of English fiction books brought in
= 290 - 190
= 100 

(b)
Number of English fiction books at first
= 5 u
= 5 x 50
= 250

Percentage increase in English fiction books
= ¹⁰⁰₂₅₀ x 100%
= 40%

Answer(s): (a) 100; (b) 40%