You are planning to purchase an empty block upon which you are considering developing a residential villa complex. The assumptions are:

$$ The land will cost $ $5\mathrm{.}2$ million to purchase.

$$ Council contribution fees will be $$800000.$

$$ The properties that we develop will be $6,000$ square metres in total.

$$ Building costs will be $$1,600$ per square metre.

$$ We will sell the properties for $$3,500$ per square metre.

$$ Sales commission to the estate agent will be $1\mathrm{.}5$ percent of the sale price. Create a working model for this business situation using a Data Validation Drop$-$Down in excel or create a built$-$in scenario analysis model for the situatio Use the two input variables 'building cost'