Respuesta :

The increase was $5.
5 goes into 20, 4 times, therefore 5 is 25% of 20.
So adding $5 to $20 increased its price by %25.
Hope this helps!
If you have any questions, just let me know :)
25-20=5
5
÷20=0.25
0.
25=25%
The markup rate is 
25%.