Assuming M$-20$ grade concrete and Fe$-415$ grade reinforcement design a dog legged staircase between foundation and first landing with the following data : elevation difference : $1\mathrm{.}5$ m; tread : $250$ mm; riser : $150$ mm; finish thickness $40$ mm on riser and tread; $10$ mm thick soffit plaster and intensity of Live Load $3000$ N $/$ sq$.$ m$.$ Adopt Limit State method of design and assume any data not mentioned. Minimum width of landing $1000$ mm$.$