14 ) On a certain afternoon , the temperature was 32℃ . Find the percentage change in the temperature .
16 ) Mr Chan's salary is increased by 15% to become $10350 . What was his salary before the increase ?
17 ) The number of residents in a small village has dropped by 15% since last year . If there are 221 residents the village this year , how many residents were there in the village last year ?
19 ) James had $5000 in his savings account last year . This year he has $10000 .
(a) Find the percentage change in his savings .
(b) James then takes out 40% of his savings from the account . Find the percentage change in his savings now as compared to last year .
20 ) The number of F.1 students in a certain scholl last year was 200. The number of F.1 students in the same school this year is 180 .
(a) Find the percentage hange in the number of F.1 students .
(b) The school takes in additional 10 F.1 students just after the school term begins . Find the percentage change in the number of F.1 students now as compared to last year .
更新1:
Ans : 12 ) 52kg 14 ) -12.5% 16 ) $9000 17 ) 260 19 ) a ) +100% b ) +20% 20 ) a) -10% b ) -5% *** 我要列式計算 ,, thx .
