A number reduced by 25% becomes 225. What percent should it be increase so that it becomes 360 ?

Question: A number reduced by 25% becomes 225. What percent should it be increase so that it becomes 360 ?

Solution:
Let
the number be x

Now
x - 25% of x = 225
x - 25x/100 = 225
(100x - 25x)/100 = 225
75x/100 = 225
75x = (225 × 100)
x = (225 × 100)/75
x = 300

Required increase :
Increase % :
= (60/300) × 100%
= 20%