A book shop had 780 comics. There were Malay, Chinese and English comics in the ratio of 1 : 3 : 8. When the book shop assistant brought in another 559 new comics, the number of Malay comics was increased by 60% and the number of Chinese comics was increased by ²₃.

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

	Malay	Chinese	English	Total
Before	1 u	3 u	8 u	780
Change	+ 0.6 u	+ 2 u	+ ?	+ 559
After	1.6 u	5 u	14 u	1339

Increase in the number of Malay comics
= 60% x 1 u
= ⁶⁰₁₀₀ x 1 u
= 0.6 u

Increase in the number of Chinese comics
= ²₃ x 3 u
= 2 u

Total number of comics at first
= 1 u + 3 u + 8 u
= 12 u

12 u = 780

1 u = 780 ÷ 12 = 65

Increase in the number of Malay and Chinese comics
= 0.6 u + 2 u
= 2.6 u
= 2.6 x 65
= 169

Number of English comics brought in
= 559 - 169
= 390 

(b)
Number of English comics at first
= 8 u
= 8 x 65
= 520

Percentage increase in English comics
= ³⁹⁰₅₂₀ x 100%
= 75%

Answer(s): (a) 390; (b) 75%