A shop had 560 comics. There were Malay, Chinese and English comics in the ratio of 7 : 2 : 5. When the shop assistant brought in another 256 new comics, the number of Malay comics was increased by 20% and the number of Chinese comics was increased by ¹₂.

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

	Malay	Chinese	English	Total
Before	7 u	2 u	5 u	560
Change	+ 1.4 u	+ 1 u	+ ?	+ 256
After	8.4 u	3 u	9 u	816

Increase in the number of Malay comics
= 20% x 7 u
= ²⁰₁₀₀ x 7 u
= 1.4 u

Increase in the number of Chinese comics
= ¹₂ x 2 u
= 1 u

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

14 u = 560

1 u = 560 ÷ 14 = 40

Increase in the number of Malay and Chinese comics
= 1.4 u + 1 u
= 2.4 u
= 2.4 x 40
= 96

Number of English comics brought in
= 256 - 96
= 160 

(b)
Number of English comics at first
= 5 u
= 5 x 40
= 200

Percentage increase in English comics
= ¹⁶⁰₂₀₀ x 100%
= 80%

Answer(s): (a) 160; (b) 80%