A book store had 260 comics. There were Chinese, English and Malay comics in the ratio of 2 : 6 : 5. When the book store assistant brought in another 144 new comics, the number of Chinese comics was increased by 60% and the number of English comics was increased by
13.
- What was the number of Malay comics that the book store assistant brought in?
- What was the percentage increase in the number of Malay comics?
|
Chinese |
English |
Malay |
Total |
Before |
2 u |
6 u |
5 u |
260 |
Change |
+ 1.2 u |
+ 2 u |
+ ? |
+ 144 |
After |
3.2 u |
8 u |
9 u |
404 |
Increase in the number of Chinese comics
= 60% x 2 u
=
60100 x 2 u
= 1.2 u
Increase in the number of English comics
=
13 x 6 u
= 2 u
Total number of comics at first
= 2 u + 6 u + 5 u
= 13 u
13 u = 260
1 u = 260 ÷ 13 = 20
Increase in the number of Chinese and English comics
= 1.2 u + 2 u
= 3.2 u
= 3.2 x 20
= 64
Number of Malay comics brought in
= 144 - 64
= 80
(b)
Number of Malay comics at first
= 5 u
= 5 x 20
= 100
Percentage increase in Malay comics
=
80100 x 100%
= 80%
Answer(s): (a) 80; (b) 80%