A store had 390 magazines. There were Chinese, English and Malay magazines in the ratio of 1 : 8 : 4. When the store assistant brought in another 216 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 store assistant brought in?
2. What was the percentage increase in the number of Malay magazines?

	Chinese	English	Malay	Total
Before	1 u	8 u	4 u	390
Change	+ 0.2 u	+ 4 u	+ ?	+ 216
After	1.2 u	12 u	7 u	606

Increase in the number of Chinese magazines
= 20% x 1 u
= ²⁰₁₀₀ x 1 u
= 0.2 u

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

Total number of magazines at first
= 1 u + 8 u + 4 u
= 13 u

13 u = 390

1 u = 390 ÷ 13 = 30

Increase in the number of Chinese and English magazines
= 0.2 u + 4 u
= 4.2 u
= 4.2 x 30
= 126

Number of Malay magazines brought in
= 216 - 126
= 90 

(b)
Number of Malay magazines at first
= 4 u
= 4 x 30
= 120

Percentage increase in Malay magazines
= ⁹⁰₁₂₀ x 100%
= 75%

Answer(s): (a) 90; (b) 75%