Question 750571
30% reduce make 210
let original number is x

30 % reduce means  100-30 =70
70% of x= 210
70/100 of x= 210
x=210x100/70  = 300
new number 450 and original is 300
increased value =450-300=150
x/100 of 300 =150
x=50 %
answer   50%