A 2.5 kg brick measures 24 cm by 12 cm by 6 cm.

Step 1. Weight. $2.5\ \text{kg} \times 9.8\ \text{m/s}^2 = 24.5\ \text{N}$.

Step 2. (a) Area $0.0288\ \text{m}^2$: $\dfrac{24.5\ \text{N}}{0.0288\ \text{m}^2} = 850.7\ \text{Pa}$.

Step 3. (b) Area $0.0072\ \text{m}^2$: $\dfrac{24.5\ \text{N}}{0.0072\ \text{m}^2} = 3402.8\ \text{Pa}$.