Answer:
350N
Step-by-step explanation:
Calculate the weight of the box by using this formula;
W = mg
W = 10 × 9.8
W = 98N
Then, total up the weight with the exerted pressure;
98N + 250N
= 348N
≈ 350N (2sf)
I hope this helps! Let me know if I miscalculated anything!