The pressure exerted by the block on the table is given by:
[tex] p=\frac{W}{A} [/tex]
where W is the weight of the box, and A is the bottom surface area of the box.
The weight of the box is: [tex] W=mg=(7.5 kg)(9.81 m/s^2)=73.6 N [/tex]
Substituting into the first equation, we find the pressure:
[tex] p=\frac{W}{A}=\frac{73.6 N}{0.6 m^2}=122.7 Pa [/tex]