中一級數學新領域(英文版)問題

Exercise 5C
1(a)increase 32 by 8
1(b)decrease 50 by 7
1(c)increase x by 1/8 of the original value
1(d)decrease y by 3/4 of the original value

2(a)increase from 10 to 11
2(b)decrease from 16 to 10
2(c)increase from 8 to 22
2(d)decrease from 25 to 14.25

3(a)after increasing a value by 2.5,the new value is 22.5
3(b)after decreasing a value by 20,the new value is 60
3(c)after increasing a value by 600,the new value is 900
3(d)after decreasing a value by 98,the new value is 98

4(a)increase 100g by 6.5%
4(b)decrease $150 by 10%
4(c)decrease 300km by 99%
4(d)increase 32 days by 150%

(需要列式)