A shop had 910 fiction books. There were Malay, Chinese and English fiction books in the ratio of 3 : 6 : 5. When the shop assistant brought in another 377 new fiction books, the number of Malay fiction books was increased by 60% and the number of Chinese fiction books was increased by ¹₃.

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	3 u	6 u	5 u	910
Change	+ 1.8 u	+ 2 u	+ ?	+ 377
After	4.8 u	8 u	7 u	1287

Increase in the number of Malay fiction books
= 60% x 3 u
= ⁶⁰₁₀₀ x 3 u
= 1.8 u

Increase in the number of Chinese fiction books
= ¹₃ x 6 u
= 2 u

Total number of fiction books at first
= 3 u + 6 u + 5 u
= 14 u

14 u = 910

1 u = 910 ÷ 14 = 65

Increase in the number of Malay and Chinese fiction books
= 1.8 u + 2 u
= 3.8 u
= 3.8 x 65
= 247

Number of English fiction books brought in
= 377 - 247
= 130 

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

Percentage increase in English fiction books
= ¹³⁰₃₂₅ x 100%
= 40%

Answer(s): (a) 130; (b) 40%