A book store had 1300 comics. There were Malay, Chinese and English comics in the ratio of 7 : 5 : 8. When the book store assistant brought in another 923 new comics, the number of Malay comics was increased by 60% and the number of Chinese comics was increased by ⁴₅.

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

	Malay	Chinese	English	Total
Before	7 u	5 u	8 u	1300
Change	+ 4.2 u	+ 4 u	+ ?	+ 923
After	11.2 u	9 u	14 u	2223

Increase in the number of Malay comics
= 60% x 7 u
= ⁶⁰₁₀₀ x 7 u
= 4.2 u

Increase in the number of Chinese comics
= ⁴₅ x 5 u
= 4 u

Total number of comics at first
= 7 u + 5 u + 8 u
= 20 u

20 u = 1300

1 u = 1300 ÷ 20 = 65

Increase in the number of Malay and Chinese comics
= 4.2 u + 4 u
= 8.2 u
= 8.2 x 65
= 533

Number of English comics brought in
= 923 - 533
= 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%