A book shop had 1040 magazines. There were Chinese, English and Malay magazines in the ratio of 3 : 8 : 2. When the book shop assistant brought in another 448 new magazines, the number of Chinese magazines was increased by 20% and the number of English magazines was increased by ¹₂.

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

	Chinese	English	Malay	Total
Before	3 u	8 u	2 u	1040
Change	+ 0.6 u	+ 4 u	+ ?	+ 448
After	3.6 u	12 u	3 u	1488

Increase in the number of Chinese magazines
= 20% x 3 u
= ²⁰₁₀₀ x 3 u
= 0.6 u

Increase in the number of English magazines
= ¹₂ x 8 u
= 4 u

Total number of magazines at first
= 3 u + 8 u + 2 u
= 13 u

13 u = 1040

1 u = 1040 ÷ 13 = 80

Increase in the number of Chinese and English magazines
= 0.6 u + 4 u
= 4.6 u
= 4.6 x 80
= 368

Number of Malay magazines brought in
= 448 - 368
= 80 

(b)
Number of Malay magazines at first
= 2 u
= 2 x 80
= 160

Percentage increase in Malay magazines
= ⁸⁰₁₆₀ x 100%
= 50%

Answer(s): (a) 80; (b) 50%