A shop had 300 magazines. There were Chinese, English and Malay magazines in the ratio of 7 : 2 : 6. When the shop assistant brought in another 164 new magazines, the number of Chinese magazines was increased by 60% and the number of English magazines was increased by ¹₂.

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

	Chinese	English	Malay	Total
Before	7 u	2 u	6 u	300
Change	+ 4.2 u	+ 1 u	+ ?	+ 164
After	11.2 u	3 u	9 u	464

Increase in the number of Chinese magazines
= 60% x 7 u
= ⁶⁰₁₀₀ x 7 u
= 4.2 u

Increase in the number of English magazines
= ¹₂ x 2 u
= 1 u

Total number of magazines at first
= 7 u + 2 u + 6 u
= 15 u

15 u = 300

1 u = 300 ÷ 15 = 20

Increase in the number of Chinese and English magazines
= 4.2 u + 1 u
= 5.2 u
= 5.2 x 20
= 104

Number of Malay magazines brought in
= 164 - 104
= 60 

(b)
Number of Malay magazines at first
= 6 u
= 6 x 20
= 120

Percentage increase in Malay magazines
= ⁶⁰₁₂₀ x 100%
= 50%

Answer(s): (a) 60; (b) 50%