what is the percent increase or decrease?

Question

Find the percent of increase or decrease. Round to the nearest percent.
1. Original: 10
New: 12

2. Original: 50
New: 56

3. Original: 30
New: 12

Answer 1

1. it increases by 2 coz new minus original is 12 - 10 so its 2

increase over original is 2 over 10.. so 2 over 10 times 100..
2/10 x 100% = 20%

2. same step . new minus original , 56-50 = 6

increase over original, 6/50, then times 100%
=12%

3. new minus original , 12- 30 = - 18
so it decreases by 18.

18/30 x 100% = 60% .. it decreases by 60%

Answer 2

1. given 10x/100=12
x/10=12 so x =120
now 12-10 = 2
% increasement= (2*100)/10=20%
2. Given 50x/100=56
x/2=56 so x = 112
now 56-50 = 6
%increasement =(6*100)/50 =12%
3. Given 30x/100=12
3x/10 =12 , (12*10)/3 = 40
now 30-12=18
%decreasement=(18*100)/30
= 60%

Answer 3

10→12, change + 2, 2/10 = 20% increase
50→56, change + 6, 6/50 = 12% increase
30→12, change -18, 18/30 = 3/5 = 60% decrease