illustrate activity on arrow with complete calculations

\begin{tabular}{|c|l|c|} \hline# & \multicolumn{1}{|c|}{ Description of the Activity } & Duration \\ \hline A & \begin{tabular}{l} Demolish wall (show on drawing), remove debris and clean the \\ area \end{tabular} & 2 \\ \hline B & \begin{tabular}{l} Prepare formwork and reinforcement for lintel above new \\ opening \end{tabular} & 1 \\ \hline C & Fix formwork and reinforcement for the lintel & 1 \\ \hline D & Cast-in-place the lintel & 1 \\ \hline E & Curing of the lintel (elapsed time) & 5 \\ \hline F & Remove the framework of the lintel & 1 \\ \hline G & Build block wall above lintel & 2 \\ \hline H & Plaster lintel and block wall above lintel & 1 \\ \hline I & \begin{tabular}{l} Select, order and receive kitchen fittings and living room \\ furniture and accessories \end{tabular} & 20 \\ \hline J & Select, order and receive ceramic and marble tiles & 10 \\ \hline K & select, order and receive lighting fixtures & 10 \\ \hline L & Select, order and receive door and windows & 12 \\ \hline M & Fix kitchen wall ceramic tiles & 2 \\ \hline N & Lay kitchen floor ceramic tiles (over cement \& sand bedding) & 3 \\ \hline O & Install kitchen suspended ceiling & 4 \\ \hline P & Install kitchen fittings & 3 \\ \hline Q & \begin{tabular}{l} Lay floor marble tiles in living room (over cement \& sand \\ bedding) \end{tabular} & 1 \\ \hline R & Fix marble skirting in living room & 4 \\ \hline S & Install living room suspended ceiling & 2 \\ \hline T & Fix cornice at the wall ceiling junction in the living room & 1 \\ \hline U & Fix living room and kitchen door and windows & 7 \\ \hline V & \begin{tabular}{l} Paint living room walls and ceiling (two coats of paint over \\ primer and filler) \end{tabular} & 1 \\ \hline W & Install living room and kitchen lighting fixtures & 2 \\ \hline X & Clean kitchen and living room & 1 \\ \hline Y & Arrange furniture \& accessories in living room & 1 \\ \hline \end{tabular}