A book store had 550 comics. There were Malay, Chinese and English comics in the ratio of 4 : 2 : 5. When the book store assistant brought in another 190 new comics, the number of Malay comics was increased by 20% and the number of Chinese comics was increased by
12.
- What was the number of English comics that the book store assistant brought in?
- What was the percentage increase in the number of English comics?
|
Malay |
Chinese |
English |
Total |
Before |
4 u |
2 u |
5 u |
550 |
Change |
+ 0.8 u |
+ 1 u |
+ ? |
+ 190 |
After |
4.8 u |
3 u |
7 u |
740 |
Increase in the number of Malay comics
= 20% x 4 u
=
20100 x 4 u
= 0.8 u
Increase in the number of Chinese comics
=
12 x 2 u
= 1 u
Total number of comics at first
= 4 u + 2 u + 5 u
= 11 u
11 u = 550
1 u = 550 ÷ 11 = 50
Increase in the number of Malay and Chinese comics
= 0.8 u + 1 u
= 1.8 u
= 1.8 x 50
= 90
Number of English comics brought in
= 190 - 90
= 100
(b)
Number of English comics at first
= 5 u
= 5 x 50
= 250
Percentage increase in English comics
=
100250 x 100%
= 40%
Answer(s): (a) 100; (b) 40%