Sales rise from £400 a week to £504 a week. Calculate the percentage increase

26%

Step-by-step explanation:

percent change = (new number - old number) / (old number) * 100%

Here, the new number is £504, and the old number is £400.

percent change = (£504 - £400) / (£400) * 100% =

= £104/£400 * 100% = 0.26 * 100% = 26%