A shop had 1275 magazines. There were Chinese, English and Malay magazines in the ratio of 8 : 7 : 2. When the shop assistant brought in another 390 new magazines, the number of Chinese magazines was increased by 40% and the number of English magazines was increased by ¹₇.

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	8 u	7 u	2 u	1275
Change	+ 3.2 u	+ 1 u	+ ?	+ 390
After	11.2 u	8 u	3 u	1665

Increase in the number of Chinese magazines
= 40% x 8 u
= ⁴⁰₁₀₀ x 8 u
= 3.2 u

Increase in the number of English magazines
= ¹₇ x 7 u
= 1 u

Total number of magazines at first
= 8 u + 7 u + 2 u
= 17 u

17 u = 1275

1 u = 1275 ÷ 17 = 75

Increase in the number of Chinese and English magazines
= 3.2 u + 1 u
= 4.2 u
= 4.2 x 75
= 315

Number of Malay magazines brought in
= 390 - 315
= 75 

(b)
Number of Malay magazines at first
= 2 u
= 2 x 75
= 150

Percentage increase in Malay magazines
= ⁷⁵₁₅₀ x 100%
= 50%

Answer(s): (a) 75; (b) 50%