A five$-$storey building with $4,920kN$ of weight contributed by the roof and $7,400kN$

of weight contributed by intermediate levels has an estimated period of $0\mathrm{.}4$ s $.$ The

specified lateral earthquake force was calculated to be $18,100kN.$ Every storey is $4\mathrm{.}3$

m tall.

Calculate the equivalent static lateral force that would be applied at the roof level of

the building.

Give your answer in kN to the nearest whole number.

Your Answer: