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Neo runs a timber business that manufactures and sells roof trusses. She sells three types: Kaplan, Purlin and beams. The cost price of Kaplan is R $250,$ Purlin R $90$ and beam is R$300$ respectively. Neo sells Kaplan for R $400$ and Purlin for R$180$ and the Beam is R$550.$ Kaplan makes up $45\%$ of total sales and $35\%$ for the Purlin and $20\%$ for the Beams. The fixed cost of the business comes to R$4100$ per month.

Calculate the following:

The gross$-$profit percentage

The weighted average gross profit

Calculate the break$-$even turn$-$over$($rand value$)$ per month if Neo wants a profit of R$4000.$