A book shop had 350 comics. There were Chinese, English and Malay comics in the ratio of 1 : 5 : 8. When the book shop assistant brought in another 90 new comics, the number of Chinese comics was increased by 60% and the number of English comics was increased by
15.
- What was the number of Malay comics that the book shop assistant brought in?
- What was the percentage increase in the number of Malay comics?
|
Chinese |
English |
Malay |
Total |
Before |
1 u |
5 u |
8 u |
350 |
Change |
+ 0.6 u |
+ 1 u |
+ ? |
+ 90 |
After |
1.6 u |
6 u |
10 u |
440 |
Increase in the number of Chinese comics
= 60% x 1 u
=
60100 x 1 u
= 0.6 u
Increase in the number of English comics
=
15 x 5 u
= 1 u
Total number of comics at first
= 1 u + 5 u + 8 u
= 14 u
14 u = 350
1 u = 350 ÷ 14 = 25
Increase in the number of Chinese and English comics
= 0.6 u + 1 u
= 1.6 u
= 1.6 x 25
= 40
Number of Malay comics brought in
= 90 - 40
= 50
(b)
Number of Malay comics at first
= 8 u
= 8 x 25
= 200
Percentage increase in Malay comics
=
50200 x 100%
= 25%
Answer(s): (a) 50; (b) 25%