Answer: 53.84%
Step-by-step explanation:
Given
The average cost of hiring is £520
The new increased cost of hiring is £800
Percentage increase is
[tex]\Rightarrow \%=\dfrac{\text{New value-old value}}{\text{old value}}\times 100[/tex]
Putting values
[tex]\Rightarrow \dfrac{800-520}{520}\times 100=53.84\%[/tex]