A shop had 375 comics. There were Malay, Chinese and English comics in the ratio of 4 : 5 : 6. When the shop assistant brought in another 235 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 shop assistant brought in?
2. What was the percentage increase in the number of English comics?

	Malay	Chinese	English	Total
Before	4 u	5 u	6 u	375
Change	+ 2.4 u	+ 4 u	+ ?	+ 235
After	6.4 u	9 u	9 u	610

Increase in the number of Malay comics
= 60% x 4 u
= ⁶⁰₁₀₀ x 4 u
= 2.4 u

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

Total number of comics at first
= 4 u + 5 u + 6 u
= 15 u

15 u = 375

1 u = 375 ÷ 15 = 25

Increase in the number of Malay and Chinese comics
= 2.4 u + 4 u
= 6.4 u
= 6.4 x 25
= 160

Number of English comics brought in
= 235 - 160
= 75 

(b)
Number of English comics at first
= 6 u
= 6 x 25
= 150

Percentage increase in English comics
= ⁷⁵₁₅₀ x 100%
= 50%

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