Answer:
75%
Step-by-step explanation:
The percent increase is calculated as
percent increase = [tex]\frac{increase}{original number}[/tex] × 100%
increase = 7 - 4 = 3, thus
% increase = [tex]\frac{3}{4}[/tex] × 100% = [tex]\frac{3(100)}{4}[/tex] = 75%